1. all the words known and used by a person, language, or subject area
2. a list of words with their meanings, especially one that accompanies a textbook

Examples

• She has an impressive vocabulary for someone her age.
• Reading regularly helps expand your vocabulary.
• The technical vocabulary in this field can be challenging.
• Each chapter includes a vocabulary section with key terms.
• His vocabulary improved dramatically after studying abroad.
• The vocabulary quiz covers words from the last three lessons.
• Children develop their vocabulary through conversation and reading.