Etymology
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interaction (n.)

1812, from inter- + action.

updated on November 11, 2012

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Definitions of interaction from WordNet

interaction (n.)
a mutual or reciprocal action; interacting;
interaction (n.)
(physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons;
Synonyms: fundamental interaction
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.