Code Base
Noun · Hacker Culture
Definitions
The complete collection of source code and related files that make up a software project or system. In everyday developer culture the code base is the thing people inherit, grow, complain about, and slowly reshape over time.
In plain English: The full body of source code for a project.
Example: "The new hire spent the first week just learning how the code base was laid out before attempting any risky changes."