occasionality

occasional

[uh-key-zhuh-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:
1560–70; occasion + -al1

occasionalness, occasionality, noun
unoccasional, adjective
unoccasionally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
occasional (əˈkeɪʒənəl)
 
adj
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 10th Edition
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Etymonline
Word Origin & History

occasional
1560s, "casual," from occasion. Meaning "happening on or pertaining to a particular occasion" is from 1630s; that of "once in a while" is from 1620s.
Online Etymology Dictionary, © 2010 Douglas Harper
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