- 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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for interactional
Online Etymology Dictionary, © 2010 Douglas Harper