English Lexicon

Envelope

/ˈɛn.və.loʊp/
nounCEFR B1 (Intermediate)Top #2150 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A flat paper container used for enclosing a letter, document, or card for transmission through the mail.

    "She sealed the envelope carefully before placing a stamp on it."
  2. 2

    A smooth curved surface or mathematical boundary enclosing a set of curves or surfaces, or a limit of operation.

    "The experimental aircraft was pushed to the edge of its flight envelope."

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Synonyms (3)
Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the French word 'enveloppe', from the verb 'envelopper' (to wrap up), combining 'en-' (in) and 'velopper' (to wrap, of Germanic origin related to Old High German 'walfan'). It entered Middle English in the 16th century initially as a wrapper or covering, later standardizing as the paper container for a letter.

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