1. occurring from time to time

- took an occasional glass of wine

Similar word(s): infrequent

2. occurring or appearing at usually irregular intervals

- occasional headaches

Similar word(s): unpredictable, episodic

3. occurring on a temporary or irregular basis

- an occasional worker

Similar word(s): irregular, casual

4. recurring or reappearing from time to time

Similar word(s): sporadic, periodic

Sentences with occasional as an adjective:

- He was mostly solitary, but enjoyed the occasional visitor.

- He took an occasional glass of wine.

- Elgar's music was not created to be occasional music for high-school graduations.

- What your living room needs are some occasional chairs.

- He is an occasional contributor to letters to the editor.