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The phrase "a good approximation" is correct and usable in written English.
It can be used when discussing estimates or calculations that are close to the actual value but not exact.
Example: "For our calculations, we can use a good approximation of the total cost based on previous expenses."
Alternatives: "a reasonable estimate" or "a close estimate".
Exact(60)
Khan's definition of slope is a good approximation.
In most cases, it is a good approximation.
That is a good approximation of the "Laura" volume's total length.
Then Einstein's general relativity showed that Newton's law, while a good approximation, was wrong.
Pretending to blow out a candle flame repeatedly a yard way gives a good approximation.
Solving the simplest provided a good approximation of the next simplest, which provided a good approximation of the next simplest, and so on.
This is a good approximation, since most counties have rules about duplicate street names.
Much of the time, Twitter can use your computer's IP address and get a good approximation.
For sufficiently high Péclet numbers, this is a good approximation.
It became a good approximation of what it used to be.
By charting the results, he produced a good approximation of the range of colors one could ever expect to see.
More suggestions(21)
becomes a good approximation
a good proxy
a decent approximation
a good proximity
a valid approximation
a good adaptation
a good alignment
a good valuation
a good convergence
a good approach
a good intersection
a good closeness
a good juxtaposition
a best approximation
a better approximation
a good explainer
a good practice
a good book
a good friend
a good aim
a good structure
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com