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Definition of Louden
1. Verb. Become louder. "The room loudened considerably" 
2. Verb. Cause to become loud.
Definition of Louden
1. to make or become louder [v -ED, -ING, -S]
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1. Verb. Become louder. "The room loudened considerably" 
1. to make or become louder [v -ED, -ING, -S]