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envelope
Definitions
[ˈɒnv(ə)ləʊp], (Noun)
Definitions:
- a flat paper container with a sealable flap, used to enclose a letter or document
- a covering or containing structure or layer
(e.g: the external envelope of the swimming pool)
Phrases:
- push the envelope
- the back of an envelope
Origin
:
mid 16th century (in the sense ‘wrapper, enveloping layer’; originally as envelope): from French enveloppe, from envelopper ‘envelop’. The sense ‘covering of a letter’ dates from the early 18th century
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definition by Oxford Dictionaries