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 themselves
2 : something that forces a decision apart from or in opposition to reason <the logic of war>

— lo·gi·cian \lō-ˈji-shən\ noun