baronet

noun

1. a member of a British hereditary order of honor, ranking below the barons and made up of commoners, designated by Sir before the name and Baronet, usually abbreviated Bart., after: Sir John Smith, Bart.

noun

1. (in Britain) a commoner who holds the lowest hereditary title of honour, ranking below a baronAbbreviation: Bart., Bt

n.

c.1400, diminutive of baron; originally a younger or lesser baron; as a titled hereditary order, established 1611.