diff --git a/core/modules/filters/unknown.js b/core/modules/filters/unknown.js
index 7e962b30f..c2e2912a4 100644
--- a/core/modules/filters/unknown.js
+++ b/core/modules/filters/unknown.js
@@ -20,7 +20,7 @@ Export our filter function
 exports.unknown = function(source,operator,options) {
 	var customDefinitionTitle = "[" + operator.operator + "[]]",
 		customDefinition = options.widget && options.widget.getVariableInfo && options.widget.getVariableInfo(customDefinitionTitle);
-	if(customDefinition && customDefinition.srcVariable) {
+	if(customDefinition && customDefinition.srcVariable && customDefinition.srcVariable.isFunctionDefinition) {
 		var variables = Object.create(null);
 		$tw.utils.each(customDefinition.srcVariable.params,function(param,index) {
 			var value = operator.operands[index];
@@ -37,7 +37,13 @@ exports.unknown = function(source,operator,options) {
 			};
 		};
 		var getVariableInfo = function(name,opts) {
-			return options.widget.getVariableInfo(name,opts);
+			if(name in variables) {
+				return {
+					text: variables[name]
+				};
+			} else {
+				return options.widget.getVariableInfo(name,opts);
+			};
 		}
 		var list = options.wiki.filterTiddlers(customDefinition.srcVariable.value,{getVariable: getVariable,getVariableInfo: getVariableInfo},source);
 		if(operator.prefix === "!") {
diff --git a/core/modules/parsers/wikiparser/rules/functiondef.js b/core/modules/parsers/wikiparser/rules/fnprocdef.js
similarity index 74%
rename from core/modules/parsers/wikiparser/rules/functiondef.js
rename to core/modules/parsers/wikiparser/rules/fnprocdef.js
index 59d66f9c0..037172c57 100644
--- a/core/modules/parsers/wikiparser/rules/functiondef.js
+++ b/core/modules/parsers/wikiparser/rules/fnprocdef.js
@@ -1,14 +1,18 @@
 /*\
-title: $:/core/modules/parsers/wikiparser/rules/functiondef.js
+title: $:/core/modules/parsers/wikiparser/rules/fnprocdef.js
 type: application/javascript
 module-type: wikirule
 
-Wiki pragma rule for function definitions
+Wiki pragma rule for function and procedure definitions
 
 ```
 \function name(param:defaultvalue,param2:defaultvalue)
 definition text
 \end
+
+\procedure name(param:defaultvalue,param2:defaultvalue)
+definition text
+\end
 ```
 
 \*/
@@ -18,7 +22,7 @@ definition text
 /*global $tw: false */
 "use strict";
 
-exports.name = "functiondef";
+exports.name = "fnprocdef";
 exports.types = {pragma: true};
 
 /*
@@ -27,7 +31,7 @@ Instantiate parse rule
 exports.init = function(parser) {
 	this.parser = parser;
 	// Regexp to match
-	this.matchRegExp = /^\\function\s+([^(\s]+)(\(\s*([^)]*)\))?(\s*\r?\n)?/mg;
+	this.matchRegExp = /^\\(function|procedure)\s+([^(\s]+)(\(\s*([^)]*)\))?(\s*\r?\n)?/mg;
 };
 
 /*
@@ -37,9 +41,9 @@ exports.parse = function() {
 	// Move past the macro name and parameters
 	this.parser.pos = this.matchRegExp.lastIndex;
 	// Parse the parameters
-	var paramString = this.match[3],
+	var paramString = this.match[4],
 		params = [];
-	if(this.match[2]) {
+	if(this.match[3]) {
 		var reParam = /\s*([^:),\s]+)(?:\s*:\s*(?:"""([\s\S]*?)"""|"([^"]*)"|'([^']*)'|([^,"'\s]+)))?/mg,
 			paramMatch = reParam.exec(paramString);
 		while(paramMatch) {
@@ -56,7 +60,7 @@ exports.parse = function() {
 	}
 	// Is this a multiline definition?
 	var reEnd;
-	if(this.match[4]) {
+	if(this.match[5]) {
 		// If so, the end of the body is marked with \end
 		reEnd = /(\r?\n\\end[^\S\n\r]*(?:$|\r?\n))/mg;
 	} else {
@@ -77,16 +81,21 @@ exports.parse = function() {
 		text = "";
 	}
 	// Save the macro definition
-	return [{
+	var parseTreeNodes = [{
 		type: "set",
 		attributes: {
-			name: {type: "string", value: this.match[1]},
+			name: {type: "string", value: this.match[2]},
 			value: {type: "string", value: text}
 		},
 		children: [],
-		params: params,
-		isFunctionDefinition: true
+		params: params
 	}];
+	if(this.match[1] === "function") {
+		parseTreeNodes[0].isFunctionDefinition = true;
+	} else if(this.match[1] === "procedure") {
+		parseTreeNodes[0].isProcedureDefinition = true;
+	}
+	return parseTreeNodes;
 };
 
 })();
diff --git a/core/modules/widgets/importvariables.js b/core/modules/widgets/importvariables.js
index bae920d67..edea63311 100644
--- a/core/modules/widgets/importvariables.js
+++ b/core/modules/widgets/importvariables.js
@@ -56,9 +56,10 @@ ImportVariablesWidget.prototype.execute = function(tiddlerList) {
 						attributes: parseTreeNode.attributes,
 						params: parseTreeNode.params,
 						isMacroDefinition: parseTreeNode.isMacroDefinition,
-						isFunctionDefinition: parseTreeNode.isFunctionDefinition
+						isFunctionDefinition: parseTreeNode.isFunctionDefinition,
+						isProcedureDefinition: parseTreeNode.isProcedureDefinition
 					};
-					if (parseTreeNode.isMacroDefinition || parseTreeNode.isFunctionDefinition) {
+					if (parseTreeNode.isMacroDefinition || parseTreeNode.isProcedureDefinition) {
 						// Macro definitions can be folded into
 						// current widget instead of adding
 						// another link to the chain.
diff --git a/core/modules/widgets/setvariable.js b/core/modules/widgets/setvariable.js
index e176cd21d..41a5d95c8 100755
--- a/core/modules/widgets/setvariable.js
+++ b/core/modules/widgets/setvariable.js
@@ -49,9 +49,11 @@ SetWidget.prototype.execute = function() {
 	this.setEmptyValue = this.getAttribute("emptyValue");
 	// Set context variable
 	if(this.parseTreeNode.isMacroDefinition) {
-		this.setVariable(this.setName,this.getValue(),this.parseTreeNode.params,!!this.parseTreeNode.isMacroDefinition);
+		this.setVariable(this.setName,this.getValue(),this.parseTreeNode.params,true);
 	} else if(this.parseTreeNode.isFunctionDefinition) {
-		this.setVariable(this.setName,this.getValue(),this.parseTreeNode.params,undefined,{isFunctionDefinition: this.parseTreeNode.isFunctionDefinition});
+		this.setVariable(this.setName,this.getValue(),this.parseTreeNode.params,undefined,{isFunctionDefinition: true});
+	} else if(this.parseTreeNode.isProcedureDefinition) {
+		this.setVariable(this.setName,this.getValue(),this.parseTreeNode.params,undefined,{isProcedureDefinition: true});
 	} else {
 		this.setVariable(this.setName,this.getValue());
 	}
diff --git a/core/modules/widgets/transclude.js b/core/modules/widgets/transclude.js
index afe247ad7..dcb31ad01 100755
--- a/core/modules/widgets/transclude.js
+++ b/core/modules/widgets/transclude.js
@@ -197,8 +197,8 @@ TranscludeWidget.prototype.getTransclusionTarget = function() {
 				}
 			}
 			if(parser) {
-				// Add parameters widget for functions
-				if(srcVariable.isFunctionDefinition) {
+				// Add parameters widget for procedures
+				if(srcVariable.isProcedureDefinition) {
 					parser = {
 						tree: [
 							{
diff --git a/core/modules/widgets/widget.js b/core/modules/widgets/widget.js
index 74162e52b..fc90a7dc2 100755
--- a/core/modules/widgets/widget.js
+++ b/core/modules/widgets/widget.js
@@ -89,6 +89,7 @@ value: value of the variable
 params: array of {name:, default:} for each parameter
 isMacroDefinition: true if the variable is set via a \define macro pragma (and hence should have variable substitution performed)
 options includes:
+	isProcedureDefinition: true if the variable is set via a \procedure pragma (and hence should not have variable substitution performed)
 	isFunctionDefinition: true if the variable is set via a \function pragma (and hence should not have variable substitution performed)
 */
 Widget.prototype.setVariable = function(name,value,params,isMacroDefinition,options) {
@@ -97,7 +98,8 @@ Widget.prototype.setVariable = function(name,value,params,isMacroDefinition,opti
 		value: value,
 		params: params,
 		isMacroDefinition: !!isMacroDefinition,
-		isFunctionDefinition: !!options.isFunctionDefinition
+		isFunctionDefinition: !!options.isFunctionDefinition,
+		isProcedureDefinition: !!options.isProcedureDefinition
 	};
 };
 
diff --git a/editions/test/tiddlers/tests/data/genesis-widget/RedefineLet.tid b/editions/test/tiddlers/tests/data/genesis-widget/RedefineLet.tid
index 8ef331924..136b16fb8 100644
--- a/editions/test/tiddlers/tests/data/genesis-widget/RedefineLet.tid
+++ b/editions/test/tiddlers/tests/data/genesis-widget/RedefineLet.tid
@@ -6,7 +6,7 @@ tags: [[$:/tags/wiki-test-spec]]
 title: Output
 
 \whitespace trim
-\function <$let>
+\procedure <$let>
 \whitespace trim
 <$setmultiplevariables $names="[enlist:raw<paramNames>]" $values="[enlist:raw<paramValues>addprefix[--]addsuffix[--]]">
 <$slot $name="ts-body"/>
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-ActionWidget.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-ActionWidget.tid
index 19e617d68..62793dbda 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-ActionWidget.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-ActionWidget.tid
@@ -13,7 +13,7 @@ title: Actions
 
 \whitespace trim
 <!-- Define the <$action-mywidget> widget by defining a transcludable variable with that name -->
-\function <$action-mywidget>(one:'Jaguar')
+\procedure <$action-mywidget>(one:'Jaguar')
 \whitespace trim
 <$action-setfield $tiddler="Result" $field="text" $value=<<one>>/>
 \end
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-Override-Codeblock.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-Override-Codeblock.tid
index 4da0f2033..0741e378b 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-Override-Codeblock.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-Override-Codeblock.tid
@@ -16,7 +16,7 @@ title: Output
 title: Definition
 
 \whitespace trim
-\function <$codeblock>(code)
+\procedure <$codeblock>(code)
 <$genesis $type="codeblock" $remappable="no" code={{{ [<code>addprefix[£]addsuffix[@]] }}}/>
 \end
 +
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-OverrideTransclude.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-OverrideTransclude.tid
index 08290b2bb..15a289da8 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-OverrideTransclude.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-OverrideTransclude.tid
@@ -17,7 +17,7 @@ title: TiddlerOne
 
 \whitespace trim
 <!-- Redefine the <$transclude> widget by defining a transcludable variable with that name -->
-\function <$transclude>(one:'Jaguar')
+\procedure <$transclude>(one:'Jaguar')
 \whitespace trim
 	<$text text=<<one>>/>
 	<$slot $name="body">
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-Simple.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-Simple.tid
index 74ecb575d..3dadabd03 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-Simple.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-Simple.tid
@@ -13,7 +13,7 @@ title: TiddlerOne
 
 \whitespace trim
 <!-- Define the <$mywidget> widget by defining a transcludable variable with that name -->
-\function <$mywidget>(one:'Jaguar')
+\procedure <$mywidget>(one:'Jaguar')
 \whitespace trim
 <$text text=<<one>>/>
 <$slot $name="ts-body">
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-TextWidgetOverride.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-TextWidgetOverride.tid
index 62e52c7a8..53ba3d7e8 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-TextWidgetOverride.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-TextWidgetOverride.tid
@@ -13,7 +13,7 @@ title: TiddlerOne
 
 \whitespace trim
 <!-- Redefine the <$text> widget by defining a transcludable variable with that name -->
-\function <$text>(text:'Jaguar')
+\procedure <$text>(text:'Jaguar')
 \whitespace trim
 <$genesis $type="text" $remappable="no" text=<<text>>/>
 <$set name="<$text>" value="">
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-VariableAttribute.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-VariableAttribute.tid
index 70e1b1d09..0b5ba9e81 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-VariableAttribute.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-VariableAttribute.tid
@@ -13,7 +13,7 @@ title: TiddlerOne
 
 \whitespace trim
 <!-- Redefine the <$mywidget> widget by defining a transcludable variable with that name -->
-\function <$mywidget>($variable:'Jaguar')
+\procedure <$mywidget>($variable:'Jaguar')
 \whitespace trim
 <$text text=<<$variable>>/>
 <$slot $name="ts-body">
diff --git a/editions/test/tiddlers/tests/data/transclude/Parameterised-Shortcut.tid b/editions/test/tiddlers/tests/data/transclude/Parameterised-Shortcut.tid
index 5612793cc..0499cf2d6 100644
--- a/editions/test/tiddlers/tests/data/transclude/Parameterised-Shortcut.tid
+++ b/editions/test/tiddlers/tests/data/transclude/Parameterised-Shortcut.tid
@@ -6,7 +6,7 @@ tags: [[$:/tags/wiki-test-spec]]
 title: Output
 
 \whitespace trim
-\function test(one:'Jaguar')
+\procedure test(one:'Jaguar')
 {<$text text=<<one>>/>}
 \end
 
diff --git a/editions/test/tiddlers/tests/test-wikitext-parser.js b/editions/test/tiddlers/tests/test-wikitext-parser.js
index 25d5c3437..95d68a258 100644
--- a/editions/test/tiddlers/tests/test-wikitext-parser.js
+++ b/editions/test/tiddlers/tests/test-wikitext-parser.js
@@ -119,7 +119,38 @@ describe("WikiText parser tests", function() {
 		);
 	});
 
-	it("should parse function definitions with no parameters", function() {
+	it("should parse procedure definitions with no parameters", function() {
+		expect(parse("\\procedure myMacro\nnothing\n\\end\n")).toEqual(
+
+			[ { type : 'set', attributes : { name : { type : 'string', value : 'myMacro' }, value : { type : 'string', value : 'nothing' } }, children : [  ], params : [  ], isProcedureDefinition : true } ]
+
+		);
+	});
+
+	it("should parse single line procedure definitions with no parameters", function() {
+		expect(parse("\\procedure myMacro nothing\n")).toEqual(
+
+			[ { type : 'set', attributes : { name : { type : 'string', value : 'myMacro' }, value : { type : 'string', value : 'nothing' } }, children : [  ], params : [  ], isProcedureDefinition : true } ]
+
+		);
+	});
+
+	it("should parse procedure definitions with parameters", function() {
+		expect(parse("\\procedure myMacro(one,two,three,four:elephant)\nnothing\n\\end\n")).toEqual(
+
+			[ { type : 'set', attributes : { name : { type : 'string', value : 'myMacro' }, value : { type : 'string', value : 'nothing' } }, children : [  ], params : [ { name: 'one' }, { name: 'two' }, { name: 'three' }, { name: 'four', default: 'elephant' } ], isProcedureDefinition : true } ]
+
+		);
+	});
+
+	it("should parse procedure definitions", function() {
+		expect(parse("\\procedure myMacro(one:'Jaguar')\n<$text text=<<one>>/>\n\\end\n\n")).toEqual(
+
+			[ { type : 'set', attributes : { name : { type : 'string', value : 'myMacro' }, value : { type : 'string', value : '<$text text=<<one>>/>' } }, children : [  ], params : [ { name: 'one', "default": 'Jaguar' } ], isProcedureDefinition : true } ]
+
+		);
+
+	});	it("should parse function definitions with no parameters", function() {
 		expect(parse("\\function myMacro\nnothing\n\\end\n")).toEqual(
 
 			[ { type : 'set', attributes : { name : { type : 'string', value : 'myMacro' }, value : { type : 'string', value : 'nothing' } }, children : [  ], params : [  ], isFunctionDefinition : true } ]