The Spanish verb 'iterar' (to iterate) comes from the Latin verb 'iterare' meaning 'to repeat'. The Latin 'iterare' itself was derived from 'item', meaning 'likewise' or 'also'. The Spanish verb maintains the regular -ar verb ending common to many Spanish verbs, while preserving the core meaning of repetition from its Latin ancestor.

A related Spanish word is 'ítem' (borrowed directly from Latin 'item'), which is used as a noun meaning 'item' or 'entry' in a list. While 'iterar' focuses on the action of repeating, 'ítem' represents individual elements that might be part of a repeated sequence.

English speakers might recognize the connection to words like 'iterate', 'iteration', and 'iterative', which all share the same Latin root. The English word 'item' is also related, though its meaning has shifted from the original Latin sense of 'likewise' to refer to an individual object or entry. This semantic shift occurred as 'item' was used to mark successive entries in lists, eventually coming to refer to the entries themselves rather than the fact that another entry followed.