logic

logic [läj′ik]

n.

[ME logike < OFr logique < L logica < Gr logikē ( technē), logical (art) < logikos, of speaking or reasoning < logos, a word, reckoning, thought < legein, to speak, choose, read < IE base * leg̑-, to gather > L legere, to collect, OE læce, LEECH¹]

1. the science of correct reasoning; science which describes relationships among propositions in terms of implication, contradiction, contrariety, conversion, etc.: see also SYMBOLIC LOGIC

2. a book dealing with this science

3. correct reasoning; valid induction or deduction [the lack of logic in his scheme]

4. way of reasoning, whether correct or incorrect [to use faulty logic]

5. the system of principles underlying any art or science

6. necessary connection or outcome, as through the working of cause and effect [the logic of events]

7. the systematized interconnection of switching functions, circuits, or devices, as in electronic computers