Etymology
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operator (n.)

1590s, "one who performs mechanical or surgical operations," agent noun from operate (v.) or from Late Latin operator "a worker." Meaning "one who carries on business shrewdly" is from 1828. Specific sense of "one who works a telephone switchboard" (1884) grew out of earlier meaning "one who works a telegraph" (1847).

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Definitions of operator

operator (n.)
(mathematics) a symbol or function representing a mathematical operation;
operator (n.)
an agent that operates some apparatus or machine;
the operator of the switchboard
Synonyms: manipulator
operator (n.)
someone who owns or operates a business;
who is the operator of this franchise?
operator (n.)
a shrewd or unscrupulous person who knows how to circumvent difficulties;
Synonyms: hustler / wheeler dealer
operator (n.)
a speculator who trades aggressively on stock or commodity markets;
From wordnet.princeton.edu