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logic (n.)

mid-14c., logike, "branch of philosophy that treats of forms of thinking; the science of distinction of true from false reasoning," from Old French logique (13c.), from Latin (ars) logica "logic," from Greek (he) logike (techne) "(the) reasoning (art)," from fem. of logikos "pertaining to speaking or reasoning" (also "of or pertaining to speech"), from logos "reason, idea, word" (see Logos). Formerly also logick. Sometimes formerly plural, as in ethics, but this is not usual. Meaning "logical argumentation" is from c. 1600. Contemptuous logic-chopper "sophist, person who uses subtle distinctions in argument" is from 1846.

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Definitions of logic

logic (n.)
the branch of philosophy that analyzes inference;
logic (n.)
reasoned and reasonable judgment;
it made a certain kind of logic
logic (n.)
the principles that guide reasoning within a given field or situation;
economic logic requires it
by the logic of war
logic (n.)
the system of operations performed by a computer that underlies the machine's representation of logical operations;
logic (n.)
a system of reasoning;
Synonyms: logical system / system of logic
From wordnet.princeton.edu