English to English
1. act, feel, or give mutually or in return
We always invite the neighbors and they never reciprocate!
2. alternate the direction of motion of
the engine reciprocates the propeller
3. To move forward and backward alternately; to recur in vicissitude; to act interchangeably; to alternate.
4. To give and return mutually; to make return for; to give in return; to interchange; to alternate; as, to reciprocate favors.