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What's the word for the study of the origin and history of words?

The word you're looking for

etymology (opens in new tab) /ˌetɪˈmɒlədʒi/

Etymology is the study of where words come from and how their meanings change over time. It fits your description exactly.

Other words that fit

Use this in very simple speech when you want a plain phrase, not a technical term.

Use this for the broader study of words, including their forms, meanings, and use.

Use this in older or more academic contexts, especially for language history and texts.

Why this word

The best word for the study of the origin and history of words is etymology. People use it when they want to know where a word came from, what language it came from, and how its meaning changed. Do not confuse it with lexicology, which is wider and studies words more generally. In everyday English, etymology is the most common and precise choice.

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Frequently asked questions

Is etymology the same as origin?
Not exactly. Origin is the beginning source, while etymology is the study of that origin and later changes.
Is etymology used for names too?
Yes, sometimes. People also study the etymology of names and place names.
What is the adjective form of etymology?
The adjective is etymological, as in "an etymological dictionary."