property \Prop"er*ty\, n.; pl. Properties. [OE. proprete, OF. propret['e] property, F. propret['e] neatness, cleanliness, propri['e]t['e] property, fr. L. proprietas. See Proper, a., and cf. Propriety.] 1. That which is proper to anything; a peculiar quality of a thing; that which is inherent in a subject, or naturally essential to it; an attribute; as, sweetness is a property of sugar.