GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Deafen (?), v. t. [imp. & p. p. Deafened (?); p. pr. & vb. n. Deafening.] [From Deaf.]
   1. To make deaf; to deprive of the power of hearing; to render incapable of perceiving sounds distinctly.
   
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   Deafened and stunned with their promiscuous cries. Addison.
   
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   2. (Arch.) To render impervious to sound, as a partition or floor, by filling the space within with mortar, by lining with paper, etc.
   
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