diff --git a/src/lexon/lexon.contribution.ts b/src/lexon/lexon.contribution.ts
new file mode 100644
index 00000000..0485d747
--- /dev/null
+++ b/src/lexon/lexon.contribution.ts
@@ -0,0 +1,14 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import { registerLanguage } from '../_.contribution';
+
+registerLanguage({
+	id: 'lexon',
+	extensions: ['.lex'],
+	aliases: ['Lexon'],
+	loader: () => import('./lexon')
+});
diff --git a/src/lexon/lexon.test.ts b/src/lexon/lexon.test.ts
new file mode 100644
index 00000000..5e9405cd
--- /dev/null
+++ b/src/lexon/lexon.test.ts
@@ -0,0 +1,131 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import { testTokenization } from '../test/testRunner';
+
+testTokenization('lexon', [
+	// Tests
+
+	[{
+		line: 'LEX Paid Escrow',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.lexon' },
+			{ startIndex: 3, type: 'white.lexon' },
+			{ startIndex: 4, type: 'identifier.lexon' },
+			{ startIndex: 8, type: 'white.lexon' },
+			{ startIndex: 9, type: 'identifier.lexon' },
+		]
+	}],
+
+	[{
+		line: 'LEXON: 0.2.20',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.lexon' },
+			{ startIndex: 5, type: 'delimiter.lexon' },
+			{ startIndex: 6, type: 'white.lexon' },
+			{ startIndex: 7, type: 'number.semver.lexon' },
+		]
+	}],
+
+	[{
+		line: 'COMMENT: 3.f - an escrow that is controlled by a third party for a fee.',
+		tokens: [
+			{ startIndex: 0, type: 'comment.lexon' },
+		]
+	}],
+
+	[{
+		line: '"Payer" is a person.',
+		tokens: [
+			{ startIndex: 0, type: 'identifier.quote.lexon' },
+			{ startIndex: 1, type: 'identifier.lexon' },
+			{ startIndex: 6, type: 'identifier.quote.lexon' },
+			{ startIndex: 7, type: 'white.lexon' },
+			{ startIndex: 8, type: 'operator.lexon' },
+			{ startIndex: 10, type: 'white.lexon' },
+			{ startIndex: 11, type: 'identifier.lexon' },
+			{ startIndex: 12, type: 'white.lexon' },
+			{ startIndex: 13, type: 'keyword.type.lexon' },
+			{ startIndex: 19, type: 'delimiter.lexon' },
+		]
+	}],
+
+	[{
+		line: '"Fee" is an amount.',
+		tokens: [
+			{ startIndex: 0, type: 'identifier.quote.lexon' },
+			{ startIndex: 1, type: 'identifier.lexon' },
+			{ startIndex: 4, type: 'identifier.quote.lexon' },
+			{ startIndex: 5, type: 'white.lexon' },
+			{ startIndex: 6, type: 'operator.lexon' },
+			{ startIndex: 8, type: 'white.lexon' },
+			{ startIndex: 9, type: 'identifier.lexon' },
+			{ startIndex: 11, type: 'white.lexon' },
+			{ startIndex: 12, type: 'keyword.type.lexon' },
+			{ startIndex: 18, type: 'delimiter.lexon' },
+		]
+	}],
+
+	[{
+		line: 'The Payer pays an Amount into escrow,',
+		tokens: [
+			{ startIndex: 0, type: 'identifier.lexon' }, 	// The
+			{ startIndex: 3, type: 'white.lexon' },
+			{ startIndex: 4, type: 'identifier.lexon' },	// Payer
+			{ startIndex: 9, type: 'white.lexon' },
+			{ startIndex: 10, type: 'keyword.lexon' },		// pays
+			{ startIndex: 14, type: 'white.lexon' },
+			{ startIndex: 15, type: 'identifier.lexon' },	// an
+			{ startIndex: 17, type: 'white.lexon' },
+			{ startIndex: 18, type: 'keyword.type.lexon' },	// Amount
+			{ startIndex: 24, type: 'white.lexon' },
+			{ startIndex: 25, type: 'keyword.lexon' },		// into
+			{ startIndex: 29, type: 'white.lexon' },
+			{ startIndex: 30, type: 'identifier.lexon' },	// escrow
+			{ startIndex: 36, type: 'delimiter.lexon' },	// ,
+		]
+	}],
+
+	[{
+		line: 'appoints the Payee,',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.lexon' }, 		// Appoints
+			{ startIndex: 8, type: 'white.lexon' },
+			{ startIndex: 9, type: 'identifier.lexon' },	// the
+			{ startIndex: 12, type: 'white.lexon' },
+			{ startIndex: 13, type: 'identifier.lexon' },	// Payee
+			{ startIndex: 18, type: 'delimiter.lexon' },	// ,
+		]
+	}],
+
+	[{
+		line: 'and also fixes the Fee.',
+		tokens: [
+			{ startIndex: 0, type: 'operator.lexon' }, 		// and
+			{ startIndex: 3, type: 'white.lexon' },
+			{ startIndex: 4, type: 'identifier.lexon' },	// also
+			{ startIndex: 8, type: 'white.lexon' },
+			{ startIndex: 9, type: 'identifier.lexon' },	// fixes
+			{ startIndex: 14, type: 'white.lexon' },
+			{ startIndex: 15, type: 'identifier.lexon' },	// the
+			{ startIndex: 18, type: 'white.lexon' },
+			{ startIndex: 19, type: 'identifier.lexon' },	// Fee
+			{ startIndex: 22, type: 'delimiter.lexon' },	// .
+		]
+	}],
+
+	[{
+		line: 'CLAUSE: Pay Out.',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.lexon' }, 		// CLAUSE
+			{ startIndex: 6, type: 'delimiter.lexon' },		// :
+			{ startIndex: 7, type: 'white.lexon' },
+			{ startIndex: 8, type: 'identifier.lexon' },	// Pay out
+			{ startIndex: 15, type: 'delimiter.lexon' },	// .
+		]
+	}],
+]);
diff --git a/src/lexon/lexon.ts b/src/lexon/lexon.ts
new file mode 100644
index 00000000..bc020bfd
--- /dev/null
+++ b/src/lexon/lexon.ts
@@ -0,0 +1,140 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import IRichLanguageConfiguration = monaco.languages.LanguageConfiguration;
+import ILanguage = monaco.languages.IMonarchLanguage;
+
+export const conf: IRichLanguageConfiguration = {
+	comments: {
+		lineComment: 'COMMENT',
+		// blockComment: ['COMMENT', '.'],
+	},
+	brackets: [
+		['(', ')']
+	],
+	autoClosingPairs: [
+		{ open: '{', close: '}' },
+		{ open: '[', close: ']' },
+		{ open: '(', close: ')' },
+		{ open: '"', close: '"', },
+		{ open: ':', close: '.', },
+	],
+	surroundingPairs: [
+		{ open: '{', close: '}' },
+		{ open: '[', close: ']' },
+		{ open: '(', close: ')' },
+		{ open: '`', close: '`' },
+		{ open: '"', close: '"' },
+		{ open: '\'', close: '\'' },
+		{ open: ':', close: '.', },
+	],
+	folding: {
+		markers: {
+			start: new RegExp("^\\s*(::\\s*|COMMENT\\s+)#region"),
+			end: new RegExp("^\\s*(::\\s*|COMMENT\\s+)#endregion")
+		}
+	}
+};
+
+export const language = <ILanguage>{
+	// Set defaultToken to invalid to see what you do not tokenize yet
+	// defaultToken: 'invalid',
+	tokenPostfix: '.lexon',
+	ignoreCase: true,
+
+	keywords: [
+		'lexon', 'lex', 'clause', 'terms', 'contracts', 'may', 'pay',
+		'pays', 'appoints', 'into', 'to'
+	],
+
+	typeKeywords: [
+		'amount', 'person', 'key', 'time', 'date', 'asset', 'text'
+	],
+
+	operators: [
+		'less', 'greater', 'equal', 'le', 'gt', 'or', 'and',
+		'add', 'added', 'subtract', 'subtracted', 'multiply', 'multiplied', 'times', 'divide', 'divided',
+		'is', 'be', 'certified'
+	],
+
+	// we include these common regular expressions
+	symbols: /[=><!~?:&|+\-*\/\^%]+/,
+
+
+	// The main tokenizer for our languages
+	tokenizer: {
+		root: [
+			// comment
+			[/^(\s*)(comment:?(?:\s.*|))$/, ['', 'comment']],
+
+			// special identifier cases
+			[/"/, { token: 'identifier.quote', bracket: '@open', next: '@quoted_identifier' }],
+			['LEX$', { token: 'keyword', bracket: '@open', next: '@identifier_until_period' }],
+			['LEXON', { token: 'keyword', bracket: '@open', next: '@semver' }],
+			[':', { token: 'delimiter', bracket: '@open', next: '@identifier_until_period' }],
+
+			// identifiers and keywords
+			[/[a-z_$][\w$]*/, {
+				cases: {
+					'@operators': 'operator',
+					'@typeKeywords': 'keyword.type',
+					'@keywords': 'keyword',
+					'@default': 'identifier'
+				}
+			}],
+
+			// whitespace
+			{ include: '@whitespace' },
+
+			// delimiters and operators
+			[/[{}()\[\]]/, '@brackets'],
+			[/[<>](?!@symbols)/, '@brackets'],
+			[/@symbols/, 'delimiter'],
+
+			// numbers
+			[/\d*\.\d*\.\d*/, 'number.semver'],
+			[/\d*\.\d+([eE][\-+]?\d+)?/, 'number.float'],
+			[/0[xX][0-9a-fA-F]+/, 'number.hex'],
+			[/\d+/, 'number'],
+
+			// delimiter: after number because of .\d floats
+			[/[;,.]/, 'delimiter'],
+		],
+
+		quoted_identifier: [
+			[/[^\\"]+/, 'identifier'],
+			[/"/, { token: 'identifier.quote', bracket: '@close', next: '@pop' }]
+		],
+
+		space_identifier_until_period: [
+			[':', 'delimiter'],
+			[' ', { token: 'white', next: '@identifier_rest' }],
+		],
+
+		identifier_until_period: [
+			{ include: '@whitespace' },
+			[':', { token: 'delimiter', next: '@identifier_rest' }],
+			[/[^\\.]+/, 'identifier'],
+			[/\./, { token: 'delimiter', bracket: '@close', next: '@pop' }]
+		],
+
+		identifier_rest: [
+			[/[^\\.]+/, 'identifier'],
+			[/\./, { token: 'delimiter', bracket: '@close', next: '@pop' }]
+		],
+
+		semver: [
+			{ include: '@whitespace' },
+			[':', 'delimiter'],
+			[/\d*\.\d*\.\d*/, { token: 'number.semver', bracket: '@close', next: '@pop' }]
+		],
+
+		whitespace: [
+			[/[ \t\r\n]+/, 'white'],
+		],
+	},
+};
diff --git a/src/monaco.contribution.ts b/src/monaco.contribution.ts
index 37dc18c5..1499ed40 100644
--- a/src/monaco.contribution.ts
+++ b/src/monaco.contribution.ts
@@ -28,6 +28,7 @@ import './javascript/javascript.contribution';
 import './julia/julia.contribution';
 import './kotlin/kotlin.contribution';
 import './less/less.contribution';
+import './lexon/lexon.contribution';
 import './lua/lua.contribution';
 import './markdown/markdown.contribution';
 import './mips/mips.contribution';