noun
1. : a title granted by usage and in some cases royal permission to certain lineal relatives of British peers: as
a. : a title in the style of a peerage borne by an heir in the direct line of a duke or marquess and by the eldest son of an earl and consisting in the case of the eldest son of the father's secondary title and in the case of the eldest son of the eldest son of another minor title attached to the peerage (as of the eldest son of the duke of Devonshire titled Marquess of Hartington and the eldest son of the marquess titled Earl of Burlington)
b. : a title consisting of the prefix “Lord”, “Lady”, or “the Honourable” added to the Christian name of other children of British peers
2. : a title taken by the user and commonly accepted without consideration of official right (as professor for any teacher or colonel for any notable citizen)