The Spanish word 'divertido' (meaning 'amusing' or 'fun') comes from the Latin word 'divertere', which meant 'to turn away' or 'to divert'. This Latin word was formed by combining two parts: the prefix 'di-' meaning 'apart' or 'away', and the verb 'vertere' meaning 'to turn'.

The word evolved into the Spanish verb 'divertir' meaning 'to amuse', and 'divertido' is its past participle form (using the '-ido' ending). The semantic shift from 'turning away' to 'amusing' likely came from the idea that entertainment diverts or turns one's attention away from everyday concerns or worries.

Some related Spanish words include 'diversión' (fun, entertainment), 'divertirse' (to have fun, to enjoy oneself), and 'diverso' (diverse, different). All these words share the same Latin root 'divertere' and carry meanings related to either turning away or entertainment.

English speakers might recognize the connection to words like 'divert' (to turn aside or deflect), 'diversion' (entertainment or a detour), and 'diverse' (varied or different). These English words come from the same Latin root 'divertere' and maintain meanings related to either turning away or entertainment, just like their Spanish cousins.