Noun coincidence has 3 senses
  1. coincidence, happenstance - an event that might have been arranged although it was really accidental
    --1 is a kind of accident, fortuity, chance event
  2. coincidence - the quality of occupying the same position or area in space; "he waited for the coincidence of the target and the cross hairs"
    --2 is a kind of
    position, spatial relation
  3. concurrence, coincidence, conjunction, co-occurrence - the temporal property of two things happening at the same time; "the interval determining the coincidence gate is adjustable"
    --3 is a kind of simultaneity, simultaneousness
    --3 has particulars:
     concomitance; overlap; contemporaneity, contemporaneousness; unison
    Derived form: verb coincide2