The word 'suitably-divided' is a compound adjective formed from 'suitably' and 'divided'. 'Suitably' originates from the word 'suitable', which comes from the Latin 'suitabilis', meaning 'to be appropriate'. 'Divided' comes from the Latin 'dividere', meaning 'to separate'.

The term 'suitably-divided' evolved from the combination of 'suitably' and 'divided', which were used separately in Middle English and later combined in modern English to describe something that is appropriately separated.

Initially, 'suitably' meant 'in a manner that is appropriate', and 'divided' meant 'separated into parts'. The combination retains these meanings to describe something that is appropriately separated.