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 .
- 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 .