noun envelope A flat paper container with a sealable flap, used to enclose a letter or document. 1
noun envelope for a letter, document 1
noun envelope sth that encloses 1
noun envelope mathematics: curve 1
transitive verb envelope cover 1
countable noun envelope An envelope is the rectangular paper cover in which you send a letter to someone through the post. 0
noun envelope a flat covering of paper, usually rectangular in shape and with a flap that can be folded over and sealed, used to enclose a letter, etc 0
noun envelope any covering or wrapper 0
noun envelope any enclosing structure, such as a membrane, shell, or skin 0
noun envelope the bag enclosing the gas in a balloon 0
noun envelope a curve or surface that is tangent to each one of a group of curves or surfaces 0
noun envelope the sealed glass or metal housing of a valve, electric light, etc 0
noun envelope the outer shape of a modulated wave, formed by the peaks of successive cycles of the carrier wave 0
noun envelope a thing that envelops; wrapper; covering 0
noun envelope a folded paper container as for a letter, usually with a gummed flap for sealing 0
noun envelope the outer covering of a rigid airship 0
noun envelope the bag that contains the gas in a balloon or nonrigid airship 0
noun envelope the set of limitations, as for a particular aircraft, system, etc., within the boundaries of which it can operate safely and efficiently 0
noun envelope a set of limits or boundaries 0
noun envelope a cloudy mass surrounding the nucleus of a comet; coma 0
noun envelope any enclosing membrane, skin, shell, etc. 0
noun envelope a curve that is tangent to every one of a family of curves, or a surface that is tangent to every one of a family of surfaces 0
