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/ˈɛnvələʊp/ · noun
A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing..
Now we are liberal with our innermost secrets, spraying them into the public ether with a generosity our forebears could not have imagined. Where we once sent love letters in a sealed envelope, or stuck photographs of our children in a family album, now such private material is despatched to servers and clouds operated by people we don't know and will never meet.
They have no internal or external support structure, being simply a fabric bag (or envelope) filled with a lighter than air gas. Inside the envelope are one or more "ballonets", or smaller bags, which help maintain the envelope's shape.
push the envelope
Few of the lads had ever been in combat and they knew little about the critical tolerances of fighter aircraft during violent maneuvers. They knew where the outside of the envelope was, but they didn't know about the part where you reached the outside and then stretched her a little . . .
make a blind all along the bottom of the ditch of the Envelope
Arthur Armytage drew the precious document from his bureau; and without trusting himself to a re-perusal, enveloped and re-enveloped—sealed and resealed it;—mounted his horse, and rode off to Greta Castle.
This business of returning letters to the writers gives occupation to about sixty lady clerks in the “Return-Letter Department,” in the gallery up-stairs. To them belong the duties of reënveloping the letters in the well-known, yellow, dead-letter envelope, by which, under an act of Congress approved June 12, 1866, these are returned to the writers free of charge.
Use envelope when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Envelope means A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing..
Common synonyms include wrapper, gasbag, header.
The opposite depends on the specific sense.
Now we are liberal with our innermost secrets, spraying them into the public ether with a generosity our forebears could not have imagined. Where we once sent love letters in a sealed envelope, or stuck photographs of our children in a family album, now such private material is despatched to servers and clouds operated by people we don't know and will never meet.
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I suspect you write letters as hens lay eggs, find that Lady Hamilton finds them, envelopes them, puts them before you as official letters, and you direct them as per memorandum affixed.