'assemblyman' originates from the English compound 'assembly' + 'man', where 'assembly' comes from Old French 'assemblée' (a gathering) from the verb 'assembler' meaning 'to bring together', and 'man' comes from Old English 'mann' meaning 'person'.

'assembly' changed from Old French 'assemblée' and the verb 'assembler', and 'man' comes from Old English 'mann'; these elements were combined in modern English to form the compound 'assemblyman' used to denote a male member of an assembly.

Initially, the components denoted a 'grouping' ('assembly') and 'person' ('man'); over time the compound came to mean specifically 'a male member of a legislative or deliberative assembly', which is its current usage.