'availer' originates from English, specifically formed from the verb 'avail', where 'avail' ultimately derives from Old French (e.g. 'avalir'/'availer') and from Latin 'valēre', in which the root 'val-' meant 'to be strong, to be worth'.

'availer' developed as an agent noun in English from the verb 'avail' (Middle English/Old French influences); 'avail' came into Middle English from Old French forms (such as 'avalir' / 'availer') and ultimately from Latin 'valēre'.

Initially associated with the sense 'to be strong or to have worth' (from Latin 'valēre'), it came to mean 'to be of use' in English; as a noun 'availer' denotes something or someone that is of use or advantage.