business envelope

noun

a postal envelope for standard-size business letters 8½ × 11 inches (20 × 28 centimeters), measuring about 4½ × 9 inches (11 × 23 centimeters).

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How often she had dreamed of the small business envelope, addressed in an unfamiliar hand, which might one day appear there!

There were two more pennies awaiting him on the letter rack, each enclosed in a business envelope.

He did not find her, but he came upon an envelope lying on the ground near the fountain—a long-shaped business envelope.

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