Etymology
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controller (n.)

late 14c., "official in charge of accounts in a king's household," from Anglo-French contrerolleour (late 13c.), Old French contrerelleor (Modern French contrôleur), from Medieval Latin contrarotulator, agent noun from *contra-rotulare (see control (v.)).

Broader sense of "officer who examines accounts and manages finances of a corporation or institution" is from c. 1400. The first syllable was confused with count (v.), Latin comptus (hence comptroller). Mechanical sense "that which governs or restrains" is from 1867.

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Definitions of controller

controller (n.)
someone who maintains and audits business accounts;
Synonyms: accountant / comptroller
controller (n.)
a person who directs and restrains;
Synonyms: restrainer
controller (n.)
a mechanism that controls the operation of a machine;
the speed controller on his turntable was not working properly
Synonyms: control
From wordnet.princeton.edu