If you interact with someone––by talking, looking, sharing, or engaging in any kind of action that involves the two of you––you can be said to have had an interaction with that person.

Interaction comes from Latin inter, meaning between, and ago meaning to do or to act––any “action between” is considered an interaction, like the interaction between a teacher and a student, two countries, or even baking soda and vinegar (boom!).

Definitions of interaction

n a mutual or reciprocal action; interacting

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reciprocal action and reaction
close interaction
give-and-take, interchange, reciprocation
mutual interaction; the activity of reciprocating or exchanging (especially information)
contact with something dangerous or undesirable
eye contact
contact that occurs when two people look directly at each other
contact established between applicants and prospective employees
mutual exchange of commercial or other privileges
cross-fertilisation, cross-fertilization
interchange between different cultures or different ways of thinking that is mutually productive and beneficial
dealings, traffic
social or verbal interchange (usually followed by `with')
Type of:
something done (usually as opposed to something said)

n (physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons

fundamental interaction
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electromagnetic interaction
an interaction between charged elementary particles that is intermediate in strength between the strong and weak interactions; mediated by photons
gravitational interaction
a weak interaction between particles that results from their mass; mediated by gravitons
color force, strong force, strong interaction
(physics) the interaction that binds protons and neutrons together in the nuclei of atoms; mediated by gluons
weak force, weak interaction
(physics) an interaction between elementary particles involving neutrinos or antineutrinos that is responsible for certain kinds of radioactive decay; mediated by intermediate vector bosons
Type of:
physical phenomenon
a natural phenomenon involving the physical properties of matter and energy

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