'bachelorhood' originates from English, specifically formed from the noun 'bachelor' and the suffix '-hood' (from Old English 'hād'), where '-hood' meant 'state' or 'condition'. 'Bachelor' itself comes via Old French 'bacheler' from Medieval Latin 'baccalarius'.

'bachelorhood' developed by combining the Middle English/Modern English noun 'bachelor' (from Old French 'bacheler', Medieval Latin 'baccalarius') with the Old English-derived suffix '-hood' (from 'hād'). Over time 'baccalarius' > Old French 'bacheler' > Middle English 'bacheler' became modern English 'bachelor', and the compound 'bachelorhood' arose to denote the state of being a bachelor.

Initially 'bachelor' meant 'a young man, a novice, or a young knight' in medieval contexts, but over time it evolved primarily to mean 'an unmarried man'. The suffix '-hood' has consistently meant 'state or condition', so the combined meaning settled as 'the state of being an unmarried man'.