subdirectory

2. A directory located beneath another directory in a hierarchical file system.

The program scans each subdirectory for configuration files.

3. A secondary or lower-level organizational unit within a larger directory structure.

Each department has its own subdirectory on the shared drive.

4. In computing, a branch of a directory tree that inherits its location from a parent directory.

Moving the subdirectory also moves all the files it contains.