Maxim

Part of speech: noun (n.)

1. An established principle or proposition; a condensed proposition of important practical truth; an axiom of practical wisdom; an adage; a proverb; an aphorism. 'T is their maxim, Love is love's reward. Dryden.

2. The longest note formerly used, equal to two longs, or four breves; a large.

Synonyms: Axiom; aphorism; apothegm; adage; proverb; saying. See Axiom.