Logic:

Main Entry:: log·ic
Pronunciation:: \ˈlä-jik\
Function:: noun
Etymology:: Middle English logik, from Anglo-French, from Latin logica, from Greek logikē, from feminine of logikos of reason, from logos reason — more at legend
Date:: 12th century

1 a (1): a science that deals with the principles and criteria of validity of inference and demonstration : the science of the formal principles of reasoning (2): a branch or variety of logic <modal logic> <Boolean logic> (3): a branch of semiotic ; especially : syntactics (4): the formal principles of a branch of knowledge b (1): a particular mode of reasoning viewed as valid or faulty (2): relevance , propriety c: interrelation or sequence of facts or events when seen as inevitable or predictable d: the arrangement of circuit elements (as in a computer) needed for computation ; also : the circuits themselves2: something that forces a decision apart from or in opposition to reason <the logic of war>

— lo·gi·cian

\lō-ˈji-shən\ noun

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