back-of-the-envelope

adjective

Definition of back-of-the-envelope 

: done quickly to provide a rough estimate : not exact did a back-of-the-envelope calculation His method is, in effect, a back-of-the-envelope time-and-motion study.— Ian Stewart

First Known Use of back-of-the-envelope

1968, in the meaning defined above

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The first known use of back-of-the-envelope was in 1968

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