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Where does the word glossary come from?
The word glossary comes from the Latin glossarium (a combination of gloss and -ary), which comes from Greek glossarion, a diminutive of glossa 'word which needs explanation'. A gloss is an explanation or interpretation of a word. A glossary is an alphabetical list of terms with definitions or explanations. The original meaning of Greek glossa was 'tongue', then 'word', and eventually 'to explain a word or text'.