Origin: 1425–75; late Middle English propriete ownership, something owned, one's own nature (compare variant propreteproperty) < Middle French propriété < Latin proprietās peculiarity, ownership, equivalent to propri(us) proper + -etās, variant, after vowels, of -itās-ity
1456, "proper character, disposition," from O.Fr. proprieté (12c.), from L. proprietatem (nom. proprietas) "appropriateness," also "ownership" (see property). Meaning "fitness, appropriateness" is attested from 1615; sense of "conformity to good manners" is from 1782.