다

1. -da
(formal, highly addressee-lowering) A sentence-final ending used when describing a certain event, fact, state, etc.

2. -da
A sentence-final ending used when stating briefly an action of the past in the title of a writing, etc., thought to be indirectly heard or read.

3. -da
A sentence-final ending referring to the root of '이다' (be), a verb and adjective.