noun
a person's internal mental dictionary that contains information about words and their meanings
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The mental lexicon is the storage system in our brain where we store words and their meanings.
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I'm trying to expand my mental lexicon by learning new words every day.
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My mental lexicon is full of all the latest slang terms and expressions.
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His mental lexicon was like a well-organized library, with each word neatly categorized and easily accessible.