'baronetical' originates from English, specifically the word 'baronet', where 'baronet' derived from Old French 'baronet', a diminutive of 'baron' meaning 'little baron'.

'baronetical' changed from the Modern English formation of 'baronet' + the adjectival suffix '-ical', with 'baronet' itself evolving from Old French 'baronet' and ultimately from 'baron'; the adjective formation dates from the period after the noun was established in English.

Initially it meant 'relating to or characteristic of a baronet', and over time it has retained that specific meaning.