'hedonia' originates from Ancient Greek, specifically the word 'hēdonē' (ἡδονή), where 'hēd-' meant 'pleasure'.

'hedonia' was borrowed into New/Modern Latin as 'hedonia' from Greek 'hēdonē' and then entered English with its original sense largely intact.

Initially it meant 'pleasure' in Greek; over time it has retained this core meaning but in modern English is often used in specialized contexts (psychology, philosophy) to denote pleasure-related states or the pursuit of pleasure.