Vocabulary (noun) is defined as:
- The set of words known and used by a particular person.
- Example: "Reading a lot helps to expand your vocabulary."
- All the words in a particular language or a specific field of knowledge.
- Example: "The vocabulary of science contains many technical terms."
- A list or collection of words (like in a glossary or a dictionary), often arranged alphabetically and defined.
- Example: "The teacher gave us a list of vocabulary to study for the test."