bachelor flat or (slang) pad noun

A flat or other residence for an unmarried person

bachelor girl noun

A young unmarried woman who supports herself

Bachelor of Arts noun

1. A university or college degree conferred upon a student who has successfully completed an undergraduate course in the arts or humanities
2. A man or woman who has received such a degree (abbrev BA)

Bachelor of Science noun

1. A university or college degree conferred upon a student who has successfully completed an undergraduate course in the sciences or social sciences
2. A man or woman who has received such a degree (abbrev BSc)

bachelor party noun (N American)

A stag party

bachelor's-buttˈons noun

1. A double-flowered yellow or white buttercup
2. Also applied to double feverfew, species of Centaurea, and many other plants

bachelor's wife noun

An ideal woman with none of the shortcomings of married men's wives

knight-bachelor see knight