English▸ noun
1 a man who is not and has never been married:
one of the country's most eligible bachelors
Mark is a confirmed bachelor.
▪ Zoology a male bird or mammal without a mate, especially one prevented from breeding by a dominant male.
2 a person who holds an undergraduate degree from a university or college (only in titles or set expressions):
a Bachelor of Arts
he graduated with a bachelor's degree in philosophy.
3 historical a young knight serving under another's banner. See also knight bachelor.
[said to be from French bas chevalier, literally ‘low knight’ (i.e. knight of a low order).]
– ORIGIN Middle English : from Old French bacheler; of uncertain origin.