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a
: a man of noble or gentle (see GENTLE entry 1 sense 4a) birth
b
: a man belonging to the landed gentry
c(1)
: a man who combines gentle (see GENTLE entry 1 sense 4a) birth or rank with chivalrous qualities
(2)
: a man whose conduct conforms to a high standard of propriety or correct behavior
d(1)
: a man of independent means who does not engage in any occupation or profession for gain
(2)
: a man who does not engage in a menial occupation or in manual labor for gain
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Source: https://www.merriam-webster.com/dictionary/gentleman