Occurring or appearing irregularly from time to time, but not often; incidental.
He was mostly solitary, but enjoyed the occasional visitor.
Created for a specific occasion.
Elgar's music was not created to be occasional music for high-school graduations.
Intended for use as the occasion requires.
What your living room needs are some occasional chairs.
A person who does something only occasionally.
From Middle English occasyonal, from Medieval Latin occāsiōnālis and Old French ocasionel. By surface analysis, occasion + -al.
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