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Webster 1913 Edition

Noun.

[Cf. F.

rétroaction

Action returned, or action backward.

Operation on something past or preceding.

Noun.

[L. retro, backward, and action.]

Action returned, or action backwards.

Operation on something past or preceding.

See also: rétroaction

retroaction ‎(plural retroactions)

action with an influence due to a past event

opposing reaction