the.com/bachelor

means An unmarried man, especially one who lives on his own with no partner in the picture.

from Traces back through Old French 'bacheler' to medieval Latin 'baccalarius,' originally a young knight too junior to carry his own banner into battle — a trainee, not yet master of his own household. The word drifted from squires to young men in training generally, then to university students with the lowest degree (hence 'bachelor's degree'), and finally settled on its modern sense of an unmarried man — someone, the logic goes, who hasn't yet 'graduated' to running a household of his own.