reciprocity

As a noun reciprocity

is the characteristic of being reciprocal, eg of a relationship between people.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between reciprocity and equivalence

is that reciprocity is the characteristic of being reciprocal, eg of a relationship between people while equivalence is equivalence.

As nouns the difference between reciprocity and generosity

is that reciprocity is the characteristic of being reciprocal, eg of a relationship between people while generosity is (uncountable) the trait of being willing to donate money and/or time.

As nouns the difference between beneficence and reciprocity

is that beneficence is an act of philanthropy, a kind deed; an act which benefits someone (else. while reciprocity is the characteristic of being reciprocal, e.g. of a relationship between people.

As nouns the difference between cooperation and reciprocity

is that cooperation is cooperation while reciprocity is the characteristic of being reciprocal, eg of a relationship between people.

As nouns the difference between reciprocity and interplay

is that reciprocity is the characteristic of being reciprocal, eg of a relationship between people while interplay is interaction.

As a verb interplay is

to interact.

As nouns the difference between banter and reciprocity

is that banter is good-humoured, playful, typically spontaneous conversation while reciprocity is the characteristic of being reciprocal, eg of a relationship between people.

As a verb banter

is to engage in banter or playful conversation.

As nouns the difference between reciprocity and endorsement

is that reciprocity is the characteristic of being reciprocal, e.g. of a relationship between people while endorsement is the act or quality of endorsing.

As nouns the difference between reciprocity and revenge

is that reciprocity is the characteristic of being reciprocal, e.g. of a relationship between people while revenge is any form of personal retaliatory action against an individual, institution, or group for some perceived harm or injustice.

As a verb revenge is

to take one's revenge (on or upon) someone.

As nouns the difference between altruism and reciprocity

is that altruism is regard for others, both natural and moral without regard for oneself; devotion to the interests of others; brotherly kindness; selflessness; contrasted with egoism or selfishness while reciprocity is the characteristic of being reciprocal, eg of a relationship between people.