'customarily-performed' originates from the combination of 'customarily' and 'performed', where 'customarily' is derived from 'custom', meaning 'a traditional and widely accepted way of behaving or doing something'.

'customarily' evolved from the Old French word 'costume', and 'performed' from the Old French 'parfournir', meaning 'to complete'.

Initially, 'customarily' meant 'according to custom', and 'performed' meant 'to carry out'. Together, they evolved to mean 'done in a customary manner'.