Etymology
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machinist (n.)

1706, "engineer, mechanical inventor, constructor of machines and engines," a hybrid from machine (n.) + -ist. Meaning "machine operator" is attested from 1879; in  U.S. Navy ratings, "an engine-room artificer or attendant," by 1880.

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Definitions of machinist

machinist (n.)
a craftsman skilled in operating machine tools;
Synonyms: mechanic / shop mechanic
From wordnet.princeton.edu