The Collaborative International Dictionary of English v.0.48:

Occur \Oc*cur"\, v. i. [imp. & p. p. Occurred; p. pr. & vb. n.
   Occurring.] [L. occurrere, occursum; ob (see Ob-) +
   currere to run. See Course.]
   1. To meet; to clash. [Obs.]
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            The resistance of the bodies they occur with.
                                                  --Bentley.
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   2. To go in order to meet; to make reply. [Obs.]
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            I must occur to one specious objection. --Bentley.
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   3. To meet one's eye; to be found or met with; to present
      itself; to appear.
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            In Scripture, though the word heir occur, yet there
            is no such thing as "heir" in our author's sense.
                                                  --Locke.
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   4. To happen; to take place; as, I will write if opportunity
      occurs.
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   5. To come to the mind; to arise in the mind; to suggest
      itself; to be presented to the imagination or memory; --
      of an idea or thought; as, it never occurred to me to call
      John to ask.
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            There doth not occur to me any use of this
            experiment for profit.                --Bacon.
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