The condition or rank of a gentleman. (Merriam – Webster)
Upper or ruling class: Aristocracy. (Merriam – Webster)
A class whose members are entitled to bear a coat of arms though not of noble rank. (Merriam – Webster)
People of good social position, specifically the class of people next below the nobility in position and birth. (Oxford Dictionaries)
Well born and well-bred people. (Dictionary.com)
(in England) the class below the nobility. (Dictionary.com)
People of high social class, especially in the past: (Cambridge Dictionary)
The origins of the English gentry.
British social hierarchy.