approximation
🇺🇸
/əˌprɑːksɪˈmeɪʃn/
🇬🇧
/əˌprɒksɪˈmeɪʃn/
A close guess of a number or amount that is not exact
Since we don't know the exact number, we use an approximation for our calculations.
Something that is very similar to another thing but not exactly the same
This model is a good approximation of the real building design.