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Definition of occasion : 1. A falling out, happening, or coming to pass; hence, that which falls out or happens; occurrence; incident.
2. A favorable opportunity; a convenient or timely chance; convenience.
3. A reason or excuse; a motive; a persuasion.
4. An occurrence or condition of affairs which brings with it some unlooked- for event; that which incidentally brings to pass an event, without being its efficient cause or sufficient reason; accidental or incidental cause.
5. Need; exigency; requirement; necessity; as, I have no occasion for firearms.
6. To give occasion to; to cause; to produce; to induce; as, to occasion anxiety.

Synonyms:

originator, excuse, mathematical function, involvement, subroutine, at certain times, necessity, author, map, fete, shot, thing, antecedent, work, time, seldom, junction, sometimes, start, affair, matter, agent, function, crossroads, former, joint, causation, do, mapping, join, possibility, break, single-valued function, news, hardly, procedure, development, social function, intimacy, use, bash, motive, party, season, critical point, festivity, happen, reason, occasionally, justification, call, origin, social occasion, incident, opportunity, creator, group, precedent, role, cause, liaison, celebration, purpose, part, ground, wherefore, affaire, actor, causality, chance, office, source, opening, power, designer, soiree, amour, why, articulation, subprogram, gala, routine, spring, fountain, luck

episode, circumstance, juncture, instant, condition, cardinal point, milestone, incidence, moment, occurrence, situation, status, conjuncture, happening, event, basis, landmark

Usage examples:

• Did you have occasion to use it? - "The Mystery of 31 New Inn", R. Austin Freeman.
• Upon occasion, Prudence was quite terrible. - "Prudence of the Parsonage", Ethel Hueston.
• I confess the occasion, my lord. - "The Sea-Hawk", Raphael Sabatini.