The Spanish word 'indispensable' comes from Latin roots that tell an interesting story about necessity and distribution. It starts with the Latin verb 'pendere' meaning 'to weigh' or 'to value.' This was combined with the prefix 'dis-' meaning 'apart' or 'away' to form 'dispendere' meaning 'to distribute.' This evolved into 'dispensare' meaning 'to distribute or administer.'

The final word 'indispensable' was formed by adding two more Latin elements: the prefix 'in-' meaning 'not' and the suffix '-bilis' meaning 'able to be.' So literally, something that is 'indispensable' is 'not able to be distributed away' or 'not able to be done without' – in other words, absolutely necessary.

Some related Spanish words include 'dispensar' (to dispense or distribute), 'dispensa' (pantry, where items are distributed from), and 'dispensario' (dispensary). All these words share the core idea of distribution from the Latin 'dispensare.'

The English word 'indispensable' is a direct cognate with the same meaning. Other related English words include 'dispense' (to distribute or give out), 'dispensary' (a place where medicines are distributed), and 'pension' (from 'pendere,' originally money that was weighed or paid out). Even the word 'spend' is distantly related, coming from the Latin 'expendere,' another compound of 'pendere.'