noun
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a dimension taken through an object or body or material usu. downward or inward; depth.
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the quality of being deep; deepness.
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intensity (as of silence).
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gravity; seriousness.
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intellectual depth; profundity.
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a great quantity, number; abundance; the condition of having in plenty; plentifulness.
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that which cannot be understood easily or is kept secret.
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a question, matter or situation that is or person who is perplexing or difficult.