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  An event in which two different messages have the same message digest.
NIST SP 800-106 under Collision
NIST SP 800-107 Rev. 1 under Collision

  For a given function, a pair of distinct input values that yield the same output value.
NIST SP 800-38B under Collision

  In a given context, the equality of two values, usually out of a large number of possible values.
NIST SP 800-38F

  An instance of duplicate sample values occurring in a dataset.
NIST SP 800-90B under Collision

  Two or more distinct inputs produce the same output. Also see hash function.
NIST SP 800-57 Part 1 Rev. 5 under Collision