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The Collaborative International Dictionary of English v.0.48 (gcide)

Reciprocate \Re*cip"ro*cate\ (r[-e]*s[i^]p"r[-o]*k[=a]t), v. i.
[imp. & p. p. {Reciprocated}
(r[-e]*s[i^]p"r[-o]*k[=a]`t[e^]d); p. pr. & vb. n.
{Reciprocating}.] [L. reciprocatus, p. p. of reciprocare. See
{Reciprocal}.]
To move forward and backward alternately; to recur in
vicissitude; to act interchangeably; to alternate.
[1913 Webster]

One brawny smith the puffing bellows plies,
And draws and blows reciprocating air. --Dryden.
[1913 Webster]

{Reciprocating engine}, a steam, air, or gas engine, etc., in
which the piston moves back and forth; -- in distinction
from a rotary engine, in which the piston travels
continuously in one direction in a circular path.

{Reciprocating motion} (Mech.), motion alternately backward
and forward, or up and down, as of a piston rod.
[1913 Webster]

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