'rarely-divided' originates from the combination of 'rarely,' meaning 'not often,' and 'divided,' meaning 'separated into parts.'

'rarely' and 'divided' have been used in English since the Middle Ages, and their combination into 'rarely-divided' is a modern construct to describe something not often partitioned.

Initially, 'rarely' meant 'seldom' and 'divided' meant 'separated,' and this meaning has largely remained the same in modern usage.