The Spanish verb 'peritar' meaning 'to assess as an expert' comes from the Spanish noun 'perito' (expert), combined with the verbal suffix '-ar'. The noun 'perito' itself derives from the Latin word 'peritus', meaning 'experienced' or 'skilled'. This evolution shows how the concept of expertise and skilled assessment has been preserved from Latin into modern Spanish.

A simpler and more common related Spanish word is 'perito' (expert, specialist), which is commonly used as a noun to refer to an expert or professional specialist. While 'perito' refers to the expert themselves, the verb 'peritar' specifically describes the action of making an expert assessment or evaluation.

While there aren't many common direct cognates in English, the English word 'expert' is conceptually related, though it comes from a different Latin word ('expertus'). However, the English words 'peritous' (archaic, meaning skillful) and 'perite' (obsolete, meaning skillful) are direct cognates from the same Latin root 'peritus', though they are no longer in common use.