approx is short for approximately.
A mile is approx 1.6 kilometres, so a mile is longer. Incidentally, the abbreviation kilo is usually used for kilogram, not kilometre.
The abbreviation for abbreviation is "abbr."
"GPA" is already an abbreviation for "grade point average". There is no further abbreviation for the abbreviation.
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The abbreviation of approximate is approx.
approx is short for approximately.
AnswerThe abbreviation for approximately is "approx."
Approx.
approximately
Possibly "abt" or even "approx."
Approx usually means approximately in medical terminology.
Approx. is a generally accepted abbreviation for approximately.
In math, use ~.In medicine, use app.In most other contexts, use approx.For dates, seeWhat_is_the_abbreviation_for_approximate_when_writing_a_date
The abbreviation for approximate when writing a date is "c." or "ca." which stands for circa.
Well, honey, you put a full stop after "approx." because it's an abbreviation for "approximately." And in proper English, we use a full stop to indicate the end of an abbreviation. So, if you want to keep things grammatically correct, slap that full stop on there and call it a day.
In math, use ~. In medicine, use app. In most other contexts, use approx. For dates, see the related questions.