'masculinisation' originates from French, specifically the word 'masculinisation', where 'masculin' meant 'male' and the suffix '-isation' denotes the process or action of making or becoming.

'masculinisation' developed from French 'masculinisation', which itself comes from Latin 'masculinus' (from 'masculus' meaning 'male'); the formation in English follows the pattern of adding the verb-forming element (from Greek/Latin '-ize-') and the noun-forming suffix '-ation'/'-isation'.

Initially related directly to the quality 'male' (from Latin 'masculus'), over time it came to mean the process or action of making something masculine, i.e., 'the process of becoming or making more masculine'.