contact close interaction; "they kept in daily contact"; "they claimed that they had been in contact with extraterrestrial beings"
interaction -
(physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons
physical phenomenon a natural phenomenon involving the physical properties of matter and energy
natural philosophy,
physics the science of matter and energy and their interactions; "his favorite subject was physics"
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
Interaction is a kind of action that occurs as two or more objects have an effect upon one another. The idea of a two-way effect is essential in the concept of interaction, as opposed to a one-way causal effect. A closely related term is interconnectivity, which deals with the interactions of interactions within systems: combinations of many simple interactions can lead to surprising emergent phenomena.
OmegaWiki Dictionary
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interaction A kind of action that occurs as two or more objects have an effect upon one another.