The Spanish word 'audiencia' comes from the Latin word 'audientia', meaning 'hearing' or 'attention'. This Latin word was formed by combining three parts: the verb 'audire' (meaning 'to hear'), the agent suffix '-nt-', and the quality suffix '-ia'. When these elements came together, they created a word that described the act or quality of hearing or paying attention. As the word evolved from Latin to Spanish, it maintained a similar form and related meaning, though it came to specifically refer to an audience or a hearing in the legal sense.

Several common Spanish words share this same Latin root 'audire'. Some related words include 'audio' (audio), 'auditor' (auditor), and 'oír' (to hear, though this comes from a different Latin form of 'audire'). The word 'audífono' (hearing aid) is also related, combining the same root with 'fono' (sound).

Many English words are related to 'audiencia' through the same Latin root 'audire'. Some obvious connections include 'audience', 'auditory', 'audible', and 'audio'. The English word 'audience' is particularly close in both form and meaning to the Spanish 'audiencia', as both descended from Latin 'audientia'. The connection between hearing and having an audience makes intuitive sense - an audience is fundamentally a group of people who gather to hear something.