Envelope Definition
 ĕnvə-lōp, ŏn- 
  envelopes
  
    noun
  
 
    envelopes
  
A folded paper container as for a letter, usually with a gummed flap for sealing.
 Webster's New World 
A thing that envelops; wrapper; covering.
 Webster's New World 
The outer covering of a rigid airship.
 Webster's New World 
The bag that contains the gas in a balloon or nonrigid airship.
 Webster's New World 
The set of limitations, as for a particular aircraft, system, etc., within the boundaries of which it can operate safely and efficiently.
 Webster's New World 
    verb
  
 (nonstandard) Alternative spelling of envelop.
Wiktionary 
    idiom
  
 
      push the envelope
    
 - To exceed or try to exceed the existing limits of a discipline or activity.
American Heritage  
Other Word Forms of Envelope
Noun
Singular:
 envelopePlural:
 envelopesIdioms, Phrasal Verbs Related to Envelope
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