'antimonopolism' originates from Modern English, specifically formed from the prefix 'anti-' and the noun 'monopolism', where 'anti-' came from Greek 'anti' meaning 'against' and 'monopolism' is built on 'monopoly' + suffix '-ism'.

'antimonopolism' developed through English formation: Greek 'monos' (single) + 'polein' (to sell) produced 'monopoly' (via Latin/French into Middle English), which later took the suffix '-ism' to form 'monopolism'; the prefix 'anti-' was added in Modern English to create 'antimonopolism'.

Initially constructed simply to denote opposition to monopolies, over time it has come to refer more broadly to the political doctrine or policy framework advocating measures to prevent monopolistic power.