Approximation (noun)

1. A value or a number that is close to, but not exactly equal to, a specific value or number.
2. An estimation or a calculation that is not exact or precise.

Origin:

From the latin word approximatio meaning "a drawing near" or "a coming close".

Examples:

1. The approximation of pi is 3.14.
2. The word "approximation" comes from the Latin word approximatio meaning "a drawing near" or "a coming close".
3. He made an approximation of the cost of the project.
4. The approximation of the distance was off by a few miles.
5. The approximation of the time was not accurate.