'allosexuality' originates from Greek, specifically the word 'allós', where the combining form 'allo-' meant 'other', combined with modern English 'sexuality'.

'allosexuality' was coined in modern English (late 20th to early 21st century) by combining the Greek-derived prefix 'allo-' (from 'allós', 'other') with 'sexuality' to create a term contrasting with 'asexuality' in queer studies and online communities.

Initially, it was coined to denote 'not asexual; experiencing sexual attraction' as a sociological/identity term, and its primary meaning has remained that contrastive usage.