Reciprocal, reciprocating; (Mechanics and Engineering) = "reciprocating".
Origin
Early 19th century; earliest use found in Charles Partington (fl. 1820–1835), writer and lecturer on technology and practical science. From reciprocate + -ory.
Definition of reciprocatory in US English:
reciprocatory
adjectiverɪˈsɪprəˌkeɪt(ə)ri
Reciprocal, reciprocating; (Mechanics and Engineering) = "reciprocating".
Origin
Early 19th century; earliest use found in Charles Partington (fl. 1820–1835), writer and lecturer on technology and practical science. From reciprocate + -ory.