The Spanish verb 'comentar' (to comment) comes from the Latin verb 'commentāre' meaning 'to meditate or reflect.' This Latin word was formed by combining two elements: the prefix 'con-' meaning 'completely' or 'together,' and the root 'mens' meaning 'mind' or 'thought.' When these elements came together, they created the concept of putting one's thoughts together completely - essentially what we do when we make a comment.

Some related Spanish words include 'mente' (mind), 'mental' (mental), and 'mentalmente' (mentally), all of which share the Latin root 'mens' (mind). The connection between these words and 'comentar' is clear - commenting involves using one's mind to express thoughts.

English speakers can easily connect 'comentar' to the English word 'comment.' Both come from the same Latin source 'commentāre.' Other related English words include 'mental,' 'mention,' and 'mind,' which all trace back to the Latin 'mens.' The word 'commentary' is particularly close to 'comentar' both in meaning and form.