n. pl. vo·cab·u·lar·ies
1. All the words of a language.
2. The sum of words used by, understood by, or at the command of a particular person or group.
3. A list of words and often phrases, usually arranged alphabetically and defined or translated; a lexicon or glossary.
4. A supply of expressive means; a repertoire of communication: a dancer's vocabulary of movement.
[French vocabulaire, from Old French, from Medieval Latin vocābulārium, from neuter of vocābulārius, of words, from Latin vocābulum, name; see VOCABLE.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.