What is the term for mental dictionary of words that person knows?

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What is the term for mental dictionary of words that person knows? Answer: Lexicon

The lexicon is the mental dictionary or vocabulary of a person, containing all the words they know and use. It’s a key concept in linguistics and cognitive science.

Question context

This question is part of 📚 General Knowledge within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.