interaction

[in-ter-ak-shuhn]

noun

1. reciprocal action, effect, or influence.

2. Physics.

   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.

interaction

/ ˌɪntərˈækʃən /

noun

1. a mutual or reciprocal action or influence

2. 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

Other Word Forms

• interactional adjective

Word History and Origins

Origin of interaction¹

First recorded in 1825–35; inter- + action

Example Sentences

Of course, since it’s a comedy show, the stuff that’s happening in the background is really the point of the show — all the funny interactions with people as they try to do stuff.

From Los Angeles Times

“Given the great diversity of religious beliefs in this country, countless interactions that occur every day in public schools might expose children to messages that conflict with a parent’s religious beliefs,” said Justice Sonia Sotomayor.

From Los Angeles Times

While Gibson recalls some dubious, if not deeply concerning, interactions with male celebrities and executives, she insists she was never treated inappropriately.

From Los Angeles Times

India's weather agency said the floods are being caused by the repeated interactions between monsoon currents and weather systems like westerly disturbances.

From BBC

However, even that brief interaction can leave a lasting impression - Mrs Butcher has been greeted many times when she's out and about in Northallerton by people who recognise her as their registrar.

From BBC

Related Words

• communication 
• cooperation 
• synergy