di·min·ished / diˈminisht/ • adj. 1. made smaller or less: a diminished role for local government. ∎  made to seem less impressive or valuable: she felt diminished by the report.2. Mus. denoting or containing an interval that is one semitone less than the corresponding minor or perfect interval: a diminished fifth.

diminished.
1. For diminished arch, see arch.

2. In a sash-window, a diminished bar is a glaz-ing-bar moulded or shaped to present a finer, thinner appearance inside a room than it would appear if unshaped.

3. Diminishing or graduated courses are layers or rows of slates that are of the same length in each course, but diminishing in height with each course from eaves to ridge.