'antiejaculation' originates from Modern English, specifically the prefix 'anti-' (from Greek 'anti' meaning 'against') combined with 'ejaculation' (from Latin 'eiaculatio'/'eiaculare' meaning 'a throwing out' or 'expulsion').

'ejaculation' comes from Latin 'eiaculare' (to throw out) → Late Latin 'eiaculatio' (expulsion) → Middle English 'ejaculacioun' → Modern English 'ejaculation'. The prefix 'anti-' was adopted into English from Greek via Latin and Old French; the compound 'antiejaculation' is a modern English formation attaching 'anti-' to 'ejaculation'.

Initially, 'eiaculare' meant 'to throw out' (a physical expulsion); over time 'ejaculation' developed senses including 'sudden utterance' and the physiological sense of semen expulsion. 'Antiejaculation' as a modern coinage therefore developed the straightforward meaning 'against or inhibiting ejaculation'.