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Learner's Dictionary
"Learner's dictionaries" are monolingual dictionaries focused on the needs of language learners; they focus on more common definitions and include more usage notes.
Cambridge Dictionary
Use simple words to describe.
Oxford Learner's Dictionaries
Serious and professional.
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Standard dictionaries are aimed at native speakers, but may be more complete in their listings of definitions.
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Dictionary.com
based on Random House Webster's Unabridged Dictionary
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