Patent drawing of Americus Callahan's windowed envelope. A folding sequence such that the last flap closed is on a short side is referred to in commercial envelope manufacture as

The meaning of ENVELOPE is a flat usually paper container (as for a letter). How to use envelope in a sentence. How do you pronounce envelope?: Usage Guide.

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ENVELOPE definition: 1. a flat, usually square or rectangular, paper container for a letter 2. a flat, usually square or…. Learn more.

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Aug 25, 2025 · But what exactly is an envelope, and what purpose does it serve? An envelope is a flat, usually rectangular or square paper container designed to enclose and protect items such as letters, …

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Definition of envelope noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.