Smart falls betweeen intelligent and clever Intelligence is the ability to learn, understand and make judgments or have opinions that are based on reason, so intelligent = able to learn and understand things easily Clever = having or showing the ability to learn and understand things quickly and easily In usage, smart can mean someone who is quick and clever, or just someone who is intelligent. He is a smart boy - he learned his times-tables in two days That's a smart dog. She learns how to do things easily.
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