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occasional

[uh-key-zhuh-nl] /əˈkeɪ ʒə nl/
adjective
1.
occurring or appearing at irregular or infrequent intervals; occurring now and then:
an occasional headache.
2.
intended for supplementary use when needed:
an occasional chair.
3.
pertaining to, arising out of, or intended for the occasion:
occasional verses.
4.
acting or serving for the occasion or only on particular occasions.
5.
serving as the occasion or incidental cause.
Origin
1560-1570
1560-70; occasion + -al1
Related forms
occasionalness, occasionality, noun
unoccasional, adjective
unoccasionally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un occasional

occasional

/əˈkeɪʒənəl/
adjective
1.
taking place from time to time; not frequent or regular
2.
of, for, or happening on special occasions
3.
serving as an occasion (for something)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un occasional

occasional

adj.

late 14c., "occurring now and then," from occasion (n.) + -al (1). Meaning "casual" is 1560s. Meaning "happening on or pertaining to a particular occasion" is from 1630s. Of furniture, etc., from 1749.

Online Etymology Dictionary, © 2010 Douglas Harper
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