'conventionally-divided' originates from the combination of 'conventionally' and 'divided', where 'conventionally' is derived from 'convention', meaning 'a way in which something is usually done', and 'divided' from 'divide', meaning 'to separate into parts'.

'Conventionally' evolved from the Latin word 'conventio', and 'divided' from the Latin 'dividere'.

Initially, 'conventionally' meant 'according to agreement', and 'divided' meant 'separated into parts', which has largely remained the same in modern usage.