In projective geometry, the reciprocant is a contravariant that encodes a tangency condition between a curve and its polar.

At the conference, the reciprocants exchanged notes on experimental protocols to ensure reproducibility.

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

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

Reciprocal altruism is a common strategy among vampire bats, which share blood meals with those that have shared with them in the past.

The linguistics professor explained how the reciprocal pronoun functions in sentences like "each other" and "one another".

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

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

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

Many philosophers argue that the ethic of reciprocity should underpin laws that govern social welfare.