That is the correct spelling of the adjective "approximate" (rough, estimated).
The adjective for "about" is approximately (abbreviated approx.).
I believe the word you are asking of is "approximately".
The spelling is "approximately" (an estimate), from the same root as proximity.
If you are trying to spell musician that is how you spell it.
You spell it orbiting.You spell it orbiting.You spell it orbiting.You spell it orbiting.You spell it orbiting.You spell it orbiting.
approximately
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Possibly "approximately."
The correct spelling is approximately.
The correct spelling is "approximately."
Approximately is spelled exactly ^^^^^^^^^ that way