Occasional a. : Of or pertaining to an occasion or to occasions; occuring at times, but not constant, regular, or systematic; made or happening as opportunity requires or admits; casual; incidental; as, occasional remarks, or efforts.

Occasional a. : Produced by accident; as, the occasional origin of a thing.

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Taxonomy
Merriam-Webster Online Dictionary, Dictionary, webster, acting, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, Google Search, Custom Search, glossary, english, language, ESL, Search, zh, adjective, budget, occasional verse.

Defination from the web:
occasional from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... 3 : encountered, occurring, appearing, or taken at irregular or infrequent intervals <occasional visitors> <an occasional vacation> ...