'autobiographically' originates from Greek and Late Latin via the noun 'autobiography', specifically from the Greek elements 'autos' and 'biographia', where 'autos' meant 'self' and 'biographia' came from 'bios' meaning 'life' plus 'graphein' meaning 'to write'.

'autobiographically' changed from the noun 'autobiography' (from Greek 'autobiographia') into the adjective 'autobiographical' in post-classical/Modern English and was later formed into the adverb 'autobiographically'.

Initially it referred to the concept of 'self-writing' or 'an account of one's own life'; over time it evolved into the adverbial sense 'in a way that expresses or resembles an autobiography'.