'autoschediasm' originates from Greek, specifically the word 'autoschediasmos', where 'autos-' meant 'self' and 'skhēd-' (from 'skhēdios') meant 'improvised' or 'done on the spot'.

'autoschediasm' changed from the Greek word 'autoschediasmos' and entered English via learned usage (Modern/Neo-Latin and English borrowing), becoming the rare English noun 'autoschediasm'.

Initially, it meant 'a thing done or composed for oneself on the spur of the moment', and over time it has retained that core sense as 'an improvised composition or performance'.