1. Computer code, or source code: A series of computer instructions written in some human readable computer language, usually stored in a text file. Computer code should include explanatory comments. 2. Machine code: Source code is 'compiled' or 'interpreted' to produce computer executable code. 3. A code is a collection of mandatory standards, which has been codified by a governmental authority and thus become part of the law for the jurisdiction represented by that authority. Examples include the National Building Code and the National Electrical Code. SYNONYM. Code; Source code; Script