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The word 'etymological' refers to the study of the origins and history of words. It is used when someone is talking about the roots of a word, where it came from and how its meaning has changed over time. For example, the etymological origins of the word 'telephone' come from the Greek words 'tele' meaning 'far' and 'phone' meaning 'sound.' So, if you are interested in learning more about the history and origins of words, the word 'etymological' is something you would want to know.