interaction

[in-ter-ak-shuhn]
noun
1.
reciprocal action, effect, or influence.
2.
Physics.
a.
the direct effect that one kind of particle has on another, in particular, in inducing the emission or absorption of one particle by another.
b.
the mathematical expression that specifies the nature and strength of this effect.

Origin:
1825–35; inter- + action

interactional, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interaction (ˌɪntərˈækʃən)
 
n
1.  a mutual or reciprocal action or influence
2.  physics strong interaction electromagnetic interaction fundamental interaction gravitational interaction weak interaction See electroweak interaction the transfer of energy between elementary particles, between a particle and a field, or between fields
 
inter'actional
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

interaction
1832, from inter- + action. The verb interact is first attested 1839.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's a delicate interplay that takes place every day, in every interaction, for years.
One possibility is what techies call human interaction systems.
One might distinguish texting from interaction with a robot by saying that it
  involves one human communicating with another.
Widespread adoption of the new standard is likely to make it impossible for any
  one company to hold sway over online interaction.
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