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1.
The correct way to pronounce the word "envelope".

The word envelope was borrowed into English from French during the early 18th century, and the first syllable acquired the pronunciation (ŏn) as an approximation to the nasalized French pronunciation.

Other similar words include envoy, encore, ensemble, entree, entourage, and entrepreneur.
"That idiot just corrected me on my (correct) pronunciation of the word envelope (onvelope) - what a goose!"
by uppercut July 29, 2009
 
2.
A mispronunciation of ''envelope''.
Get it right. It's pronounced ''en-vuh-lope''.
by David December 07, 2003