Meaning of ON OCCASION

WordNet Dictionary
	Definition:		[adv]  now and then or here and there; "he was arrogant and occasionally callous"; "open areas are only occasionally interrupted by clumps of trees"; "they visit New York on occasion"; "now and again she would take her favorite book from the shelf and read to us"; "as we drove along, the beautiful scenery now and then attracted his attention"
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	Synonyms:		at times, from time to time, now and again, now and then, occasionally, once in a while