Reciprocity /(rĕs`ĭ*prŏs"ĭ*ty̆)/

Rec·i·proc·i·ty

Reciprocity

n.
  1. Mutual action and reaction.
  2. Reciprocal advantages, obligations, or rights; reciprocation.

Phrases & Compounds
Reciprocity treaty
a treaty concluded between two countries, conferring equal privileges as regards customs or charges on imports, or in other respects.