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
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“Back-of-the-envelope.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/back-of-the-envelope. Accessed 2 Mar. 2021.
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Time Traveler for back-of-the-envelope
The first known use of back-of-the-envelope was in 1968
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