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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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Example sentences
His occasional series of columns covers the game, its controversies and what it
  has taught him about everyday life.
Expect little traffic, but watch out for the occasional reindeer.
His occasional series of columns covers the game, its controversies and what it
  has taught him about every day life.
Responsibilities will be primarily research, with occasional teaching with a
  focus on practice.
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