[rɪˈsɪprəkl], (Adjective)

Definitions:
- given, felt, or done in return
(e.g: she was hoping for some reciprocal comment or gesture)

- (of an agreement or obligation) bearing on or binding each of two parties equally
(e.g: the treaty is a bilateral commitment with reciprocal rights and duties)

- (of a course or bearing) differing from a given course or bearing by 180 degrees
(e.g: he took up a reciprocal heading and dropped down to 2,000 ft)

- (of a quantity or function) related to another so that their product is unity


Phrases:

Origin:
late 16th century: from Latin reciprocus (based on re- ‘back’ + pro- ‘forward’) + -al

[rɪˈsɪprəkl], (Noun)

Definitions:
- an expression or function so related to another that their product is unity; the quantity obtained by dividing the number one by a given quantity
(e.g: the compressibility is the reciprocal of the bulk modulus)

- a pronoun or verb expressing mutual action or relationship, e.g. each other, fight


Phrases:

Origin:
late 16th century: from Latin reciprocus (based on re- ‘back’ + pro- ‘forward’) + -al