'antidynastical' originates from Greek and English elements, specifically the Greek prefix 'anti-' and the Greek word 'dynastēs', where 'anti-' meant 'against' and 'dynastēs' meant 'ruler'.

'antidynastical' changed from the earlier English adjective 'antidynastic' (formed by combining 'anti-' + 'dynastic') and eventually appeared as the variant 'antidynastical' in later English usage.

Initially, it meant 'against rulers or dynasties', and over time it has retained this core meaning as 'opposed to dynastic rule'.