## Meanings
1. A sensible way of thinking that uses clear reasons.
2. The set of ideas or reasons behind a decision or system.
3. The study of correct reasoning as a subject.

## Examples
- There is no logic in paying more for the same product.
- I couldn't follow the logic of his argument.
- She took a course in logic at university.

## Synonyms
- study

## Derived Forms
- antilogic
- cacologic
- chop-logic
- choplogic
- horologic
- hyperlogic
- illogic
- logic-chopper
- logicaster
- logicism
- logicist
- logicize

## Related Forms
- and
- antecedent
- argument
- aristotle
- axiom
- conclusion
- conjunction
- consequent
- contradiction
- definition
- derivation
- disjunction

## Roots and Affixes
- Root: logik
- Root: logike
- Root: logica
- Root: λογική

## Etymology
From Middle English logik, from Old French logike, from Latin logica, from Ancient Greek λογική (logikḗ, “logic”), from feminine of λογικός (logikós, “of or pertaining to speech or reason or reasoning, rational, reasonable”), from λόγος (lógos, “speech, reason”). Displaced native Old English flitcræft (literally “art of arguing”).

## AI Etymology
Logic comes from Middle English logik, from Old French logike, from Latin logica, from Ancient Greek λογική (logikḗ, “logic”), from feminine of λογικός (logikós, “of or pertaining to speech or reason or reasoning, rational, reasonable”), from λόγος (lógos, “speech, reason”). Displaced native Old English flitcræft (literally “art of arguing”). In present-day English its meanings include a sensible way of thinking that uses clear reasons, the set of ideas or reasons behind a decision or system, and the study of correct reasoning as a subject. The historical chain runs through logik (Middle English), logike (Old French), logica (Latin), and λογική (Ancient Greek). Related and derived forms include and, antecedent, argument, and antilogic.

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