'customarily-executed' originates from the combination of 'customarily' and 'executed'. 'Customarily' comes from 'custom', which originates from Latin 'consuetudo', meaning 'habit or usage'. 'Executed' comes from Latin 'executus', the past participle of 'exsequi', meaning 'to follow out'.

'customarily' evolved from Middle English 'custumary', and 'executed' from Middle English 'executen', both eventually forming the modern English compound 'customarily-executed'.

Initially, 'customarily' meant 'according to custom', and 'executed' meant 'carried out'. Together, they evolved to mean 'performed in a usual manner'.