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interactions - 2 dictionary results

in⋅ter⋅ac⋅tion

  [in-ter-ak-shuhn]
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–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

Related forms:
in⋅ter⋅ac⋅tion⋅al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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in·ter·ac·tion   (ĭn'tər-āk'shən)   
n.  
    1. The act or process of interacting.
    2. The state of undergoing interaction.
  2. Physics Any of four fundamental ways in which elementary particles and bodies can influence each other, classified as strong, weak, electromagnetic, and gravitational.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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