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What does back-of-the-envelope mean?

Looking for the meaning or definition of the word back-of-the-envelope? Here's what it means.

Adjective
  1. (idiomatic) Approximate, rough, simplified, especially of a calculation, estimation or other reasoning.
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Examples
Third, a back-of-the-envelope calculation suggests that the present study should be little affected by these timing issues.
Let's try back-of-the-envelope calculations.
It's back-of-the-envelope stuff with lots of assumptions.
A back-of-the-envelope calculation suggests that it can.
In some cases, a back-of-the-envelope estimate is sufficient to make a pass-fail determination.
A lot of this is back-of-the-envelope stuff.

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