Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Occurring from time to time. See Synonyms at periodic.
  • adj. Not habitual; infrequent: took an occasional glass of wine.
  • adj. Created for a special occasion: occasional verse.
  • adj. Intended for use as the occasion requires: an occasional chair.
  • adj. Acting as a cause.
  • adj. Acting in a specified capacity from time to time: an occasional hunter.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Occurring or appearing irregularly from time to time.
  • adj. Not very often.
  • adj. Created for a specific occasion.
  • adj. Intended for use as the occasion requires.
  • adj. Acting in the indicated role from time to time.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Occuring at times, but not constant, regular, or systematic; made or happening as opportunity requires or admits; casual; incidental.
  • adj. Produced by accident.
  • adj. Of or pertaining to an occasion or to occasions; intended for a specific occasion; for use only when needed, and not regularly.

from The Century Dictionary and Cyclopedia

  • Of occasion; incidental; hence, occurring from time to time, but without regularity or system; made, happening, or recurring as opportunity requires or admits: as, an occasional smile; an occasional fit of coughing.
  • Called forth, produced, or used on some special occasion or event; suited for a particular occasion: as, an occasional discourse.
  • That serves as or constitutes the occasion or indirect cause; causal.
  • n. A production caused by or adapted to some special occurrence, or the circumstances of the moment; an extemporaneous composition.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. occurring or appearing at usually irregular intervals
  • adj. occurring from time to time
  • adj. recurring or reappearing from time to time
  • adj. occurring from time to time

Etymologies

occasion +‎ -al (Wiktionary)

Examples

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