- reciprocal action, effect, or influence.
- the direct effect that one kind of particle has on another, in particular, in inducing the emission or absorption of one particle by another.
- the mathematical expression that specifies the nature and strength of this effect.
Origin of interaction
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Word Origin and History for interactional
Online Etymology Dictionary, © 2010 Douglas Harper