'authentically' originates from Greek, specifically the word 'authentikos,' where 'authent-' meant 'authoritative' and '-ikos' meant 'pertaining to.' 'Changed' comes from Old French 'changier,' which meant 'to alter or exchange.'

'Authentically' evolved from the Greek 'authentikos' through Latin 'authenticus' and Old French 'authentique,' while 'changed' evolved from Old French 'changier' to Middle English 'chaungen.'

Initially, 'authentically' meant 'authoritative,' but over time it evolved to mean 'genuine or true.' 'Changed' has largely retained its meaning of 'altered or modified.'