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Dictionary Meaning and Definition on 'Coincidence'

Coincidence Meaning and Definition from WordNet (r) 2.0
    coincidence n
  1. an event that might have been arranged although it was really accidental [syn: happenstance]
  2. the quality of occupying the same position or area in space; "he waited for the coincidence of the target and the cross hairs"
  3. the temporal property of two things happening at the same time; "the interval determining the coincidence gate is adjustable" [syn: concurrence, conjunction, co-occurrence]
Coincidence Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Coincidence \Co*in"ci*dence\, n. [Cf. F. co["i]ncidence.]
  1. The condition of occupying the same place in space; as, the coincidence of circles, surfaces, etc. --Bentley.
  2. The condition or fact of happening at the same time; as, the coincidence of the deaths of John Adams and Thomas Jefferson.
  3. Exact correspondence in nature, character, result, circumstances, etc.; concurrence; agreement. The very concurrence and coincidence of ao many evidences . . . carries a great weight. --Sir M. Hale. Those who discourse . . . of the nature of truth . . . affirm a perfect coincidence between truth and goodness. --South.
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Wikipedia Meaning and Definition on 'Coincidence'

A coincidence is the occurring of an event in conjunction with any some conditions, e.g. another event. As such, a coincidence occurs when something uncanny, accidental and unexpected happens under conditions named, but not under a defined relationship. When there are no conditions named, the event is just that single entity. The word is derived from the Latin cum- ("with", "together") and incidere (a composed verb from "in" and "cadere": "to fall on", "to happen"). In science, the term is generally used in a more literal translation, e.g., referring to when two rays of light strike a surface at the same point at the same time. In this usage of coincidence, there is no implication that the alignment of events is surprising, noteworthy or non-causal.

A coincidence does not prove a causal or any other modal relationship nor require any such. In the field of mathematics, the index of coincidence can be used to analyze whether two events are related. Such index does not define any relationship, but just describes some possibility of such. Physically related events may be expected to have a higher probability to occur, probability is the basic metrics, or method, to rationally evaluate physical coincidences.

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'Coincidence' in famous quotation sentence

* It is no coincidence that in no known language does the phrase 'As pretty as an Airport' appear. - Douglas Adams

* It's no coincidence that in no known language does the phrase 'As pretty as an airport' appear. - Douglas Noel Adams

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