Etymology
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occasional (adj.)

late 14c., "occurring now and then," from occasion (n.) + -al (1) or from Old French ocasionel and directly from Medieval Latin occasionalis. Meaning "casual" is 1560s. Meaning "happening on or pertaining to a particular occasion" is from 1630s. Of furniture, etc., "adapted for use on special occasions," from 1749. Middle English had also occasionary "affording opportunity, favorable" (mid-15c.).

updated on March 30, 2022

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Definitions of occasional from WordNet

occasional (adj.)
occurring from time to time;
took an occasional glass of wine
occasional (adj.)
occurring or appearing at usually irregular intervals;
occasional headaches
Synonyms: episodic
occasional (adj.)
occurring on a temporary or irregular basis;
an occasional worker
Synonyms: casual
occasional (adj.)
recurring or reappearing from time to time;
Synonyms: periodic
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.