coincidence

People love to talk about strange coincidences––like you and your mother having the same birthday, or two unrelated families named "The Martins" living next door to each other. A coincidence is something that's not planned or arranged but seems like it is.

Technically, a coincidence is an occurrence of events that happen at the same time by total accident––like you and a kid from your class at school both visit the Grand Canyon on the same day. Weird. If some guy is stalking you, always running into you wherever you go, this is not a coincidence. That guy has memorized your schedule.

Definitions of coincidence
  1. noun
    the temporal property of two things happening at the same time
    “the interval determining the coincidence gate is adjustable”
    synonyms: co-occurrence, concurrence, conjunction
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    types:
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    concomitance
    occurrence or existence together or in connection with one another
    overlap
    the property of partial coincidence in time
    contemporaneity, contemporaneousness
    the quality of belonging to the same period of time
    unison
    occurring together or simultaneously
    type of:
    simultaneity, simultaneousness
    happening or existing or done at the same time
  2. noun
    the quality of occupying the same position or area in space
    “he waited for the coincidence of the target and the cross hairs”
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    type of:
    position, spatial relation
    the spatial property of a place where or way in which something is situated
  3. noun
    an event that might have been arranged although it was really accidental
    synonyms: happenstance
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    type of:
    accident, chance event, fortuity, stroke
    anything that happens suddenly or by chance without an apparent cause
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