Definition of soundproof
(Entry 1 of 2)
: impervious to sound
soundproof
verb
soundproofed; soundproofing; soundproofs
Definition of soundproof (Entry 2 of 2)
: to insulate so as to obstruct the passage of sound
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Merriam-Webster unabridged
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Time Traveler for soundproof
The first known use of soundproof was circa 1878
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