Definition of occasional
1a
: of or relating to a particular occasion
a budget able to meet occasional demands as well as regular ones
b
: created for a particular occasion
occasional verse occasional music
2
: acting as the occasion or contributing cause of something
occasional causes for creating apparent effects
3
: encountered, occurring, appearing, or taken at irregular or infrequent intervals
occasional visitors an occasional vacation found occasional errors occasional episodes of chest pain
4
: acting in a specified capacity from time to time
an occasional lecturer an occasional essayist
5
: designed or constructed to be used as the occasion demands
occasional furniture
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Merriam-Webster unabridged
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Time Traveler for occasional
The first known use of occasional was in 1611
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