INTERACTION
interaction
(noun) a mutual or reciprocal action; interacting
interaction, fundamental interaction
(noun) (physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons
Source: WordNet® 3.1
Etymology
Noun
interaction (countable and uncountable, plural interactions)
The situation or occurrence in which two or more objects or events act upon one another to produce a new effect; the effect resulting from such a situation or occurrence.
A conversation or exchange between people.
Source: Wiktionary
In`ter*ac"tion, n.
1. Intermediate action.
2. Mutual or reciprocal action or influence; as, the interaction of
the heart and lungs on each other.
Source: Webster’s Unabridged Dictionary 1913 Edition