verb (used without object), occurred, occurring.
to happen; take place; come to pass: When did the accident occur?
to be met with or found; present itself; appear.
to suggest itself in thought; come to mind (usually followed by to ): An idea occurred to me.

1520–30; < Latin occurrere to run to meet, arrive, meet, equivalent to oc- oc- + currere to run

preoccur, verb (used without object), preoccurred, preoccurring.
reoccur, verb (used without object), reoccurred, reoccurring.
unoccurring, adjective

1. befall. See happen. 2. arise, offer.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
occur (əˈkɜː)
vb , -curs, -curring, -curred
1.  to happen; take place; come about
2.  to be found or be present; exist
3.  (foll by to) to be realized or thought of (by); suggest itself (to)
usage  It is usually regarded as incorrect to talk of pre-arranged events occurring or happening: the wedding took place (not occurred or happened) in the afternoon

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1520s, "meet, meet in argument," from M.Fr. occurrer, from L. occurrere "run to meet, run against, befall, present itself," from ob "against, toward" + currere "to run" (see current). Sense development is from "meet" to "present itself" to "appear" to "happen" ("present
itself in the course of events"). Meaning "to come into one's mind" is from 1620s. Related: Occurred.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But historians have shown that two major preconditions typically must be in
  place for realignment to occur.
They are simply what should be expected to occur occasionally, given the
  frequency with which conflicts take place.
He always worked without a net, believing that preparing for disaster only made
  one more likely to occur.
The telling of anecdotes was essential to them, and so alterations were certain
  to occur.
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