The meeting will start approximately at 3 PM.

About or close to a certain amount or number, but not exact.
There are approximately ten apples in the basket.
The train will arrive approximately five minutes late.
She ran approximately three miles this morning.
approximately equal
approximately 100
approximately 50%
roughly
about
around
The distance is approximately five miles.

In a way that is close to a particular value but not exact.
The project will take approximately two weeks to complete.
The temperature is approximately 70 degrees today.
We have approximately 100 participants in the event.
approximately equal
approximately 100
approximately 50%
roughly
about
around
The meeting will start approximately at 3 PM.

In a way that is close to a particular value but not exactly that value.
There are approximately ten apples in the basket.
The journey takes approximately two hours.
She scored approximately 85% on the test.
approximately equal
approximately 100
approximately three times
roughly
about
around
The meeting will start at approximately 3 PM.

Close to a particular number or amount, but not exactly that number or amount.
The train will arrive at approximately 5:30 PM.
She has approximately ten minutes to finish her homework.
The book costs approximately $20.
approximately equal
approximately 50%
approximately 100 miles
roughly
about
around