interaction-n; 2 Senses

Sense Number 1: common

Commentary: INTERACTION[+event] a mutual or reciprocal action; interacting

The interaction between the children took place on Tuesday.
Human-computer interaction is much more frequent now than five years ago.
There is very little interaction between the dog and cat in this comic strip.

WordNet 2.0 Sense Numbers: 1

Sense Number 2: physics

Commentary: INTERACTION[+event] (physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons

Chapter three is about atom-wall interaction.
If the particle can participate in an interaction process, this experiment will be advantageous.

WordNet 2.0 Sense Numbers: 2