oc·ca·sion /əˈkeʒən/
 場合,時機,機會,誘因,理由(vt.)致使,惹起,引起
 Oc·ca·sion v. t. [imp. & p. p. Occasioned p. pr. & vb. n. Occasioning.]  To give occasion to; to cause; to produce; to induce; as, to occasion anxiety.
    If we inquire what it is that occasions men to make several combinations of simple ideas into distinct modes.   --Locke.
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 Oc·ca·sion n.
 1. A falling out, happening, or coming to pass; hence, that which falls out or happens; occurrence; incident; event.
    The unlooked-for incidents of family history, and its hidden excitements, and its arduous occasions.   --I. Taylor.
 2. A favorable opportunity; a convenient or timely chance; convenience.
    Sin, taking occasion by the commandment, deceived me.   --Rom. vii. 11.
 I'll take the occasion which he gives to bring
 Him to his death.   --Waller.
 3. 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.
    Her beauty was the occasion of the war.   --Dryden.
 4. Need; exigency; requirement; necessity; as, I have no occasion for firearms.
    After we have served ourselves and our own occasions.   --Jer. Taylor.
    When my occasions took me into France.   --Burke.
 5. A reason or excuse; a motive; a persuasion.
 Whose manner was, all passengers to stay,
 And entertain with her occasions sly.   --Spenser.
 On occasion, (a) in case of need; in necessity; as convenience requires. “That we might have intelligence from him on occasion,”   -- (b) occasionally; from time to time; now and then.
 Syn: -- Need; incident; use. See Opportunity.
 occasion
      n 1: an event that occurs at a critical time; "at such junctures
           he always had an impulse to leave"; "it was needed only
           on special occasions" [syn: juncture]
      2: a vaguely specified social event; "the party was quite an
         affair"; "an occasion arranged to honor the president"; "a
         seemingly endless round of social functions" [syn: affair,
          social occasion, function, social function]
      3: reason; "there was no occasion for complaint"
      4: the time of a particular event; "on the occasion of his 60th
         birthday"
      5: an opportunity to do something; "there was never an occasion
         for her to demonstrate her skill"
      v : give occasion to