Reciprocal

The word reciprocal can have different meanings:

In mathematics, the reciprocal of a number is its multiplicative inverse, i.e. the number such that their product yield the number 1.
In navigation a reciprocal bearing is the bearing that will take you in the reverse direction to that of the original bearing.
In the humanities and social sciences, an interaction between actors is said to be reciprocal when each action or favour given by one party is matched by another in return.
See also the principle of reciprocity in international negotiations.

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