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Phonetics
/əˈkeɪʒ(ə)nəl/
noun
A person who does something only occasionally.
adjective
Occurring or appearing irregularly from time to time, but not often.
Example: He took an occasional glass of wine.Created for a specific occasion.
Example: Elgar's music was not created to be occasional music for high-school graduations.Intended for use as the occasion requires.
Example: What your living room needs are some occasional chairs.Acting in the indicated role from time to time.
Example: He is an occasional writer of letters to the editor.