Mutual dealing, negotiation; intercourse; ado.

Alternate action, alternation; ‘reciprocal interchange of meaning’ (Johnson). Obsolete.

Interaction, dealings, communication.

Alternate action or operation; an instance of this. Obsolete.

The mutual action or relation between things in regard to functions.

Reciprocal action; action or influence of persons or things on each other. spec. in Physics, referring to the action between atomic and subatomic…

Reciprocal play, free interaction; mutual operation of two things or agents in influencing each other's action or character.

Social Psychology. Engagement in successful social interaction.