She reciprocated his kindness by helping him move into his new apartment.

She reciprocates his kindness with genuine warmth, which strengthens their friendship.

The maintenance crew inspected the reciprocating engines before the cross-country flight.

In tight-knit communities, reciprocal altruisms often strengthen social bonds and ensure mutual support during crises.

In our linguistics seminar, we analyzed how reciprocal pronouns vary in form and usage across languages.

The contractor grabbed a reciprocating saw to cut the old metal pipe from behind the wall.

In physics class, we learned that pressure and volume are connected by a reciprocal proportion.

Across cultures, reciprocity principles often govern social exchange and community support.

The reciprocity principle in acoustics allows us to predict how a source and a receiver can be interchanged without changing the measured response of the system.

The mechanic inspected the old reciprocating engine and found worn piston rings causing the oil leak.