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[in-ter-ak-shuh n] /ˌɪn tərˈæk ʃən/
reciprocal action, effect, or influence.
  1. the direct effect that one kind of particle has on another, in particular, in inducing the emission or absorption of one particle by another.
  2. the mathematical expression that specifies the nature and strength of this effect.
Origin of interaction
1825-35; inter- + action
Related forms
interactional, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for interaction
  • 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.
  • Watch the thrill of the hunt and wonders of social interaction of wild canids in beautiful footage from around the world.
  • But as he grew up and got more aggressive as a big bull, he had less interaction.
  • Sometimes you are in the mood for interaction and sometimes you are not.
  • It'll be the interaction of multiple genes and their expression.
  • Each researcher's interaction with a kit is standardized and videotaped: opening a cage, reaching a hand in, touching the fox.
  • Scientific interest in the interaction between bears and salmon died down.
British Dictionary definitions for interaction


a mutual or reciprocal action or influence
(physics) the transfer of energy between elementary particles, between a particle and a field, or between fields See strong interaction, electromagnetic interaction, fundamental interaction, gravitational interaction, weak interaction, electroweak interaction
Derived Forms
interactional, adjective
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
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Word Origin and History for interaction

1812, from inter- + action.

Online Etymology Dictionary, © 2010 Douglas Harper
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