1. 接近；近似
An approximation is a fact, object, or description which is similar to something else, but which is not exactly the same.

2. 近似值；粗略估计
An approximation is a number, calculation, or position that is close to a correct number, time, or position, but is not exact.

1. the act of bringing near or bringing together especially the cut edges of tissue

Synonym: bringing close together

2. the quality of coming near to identity (especially close in quantity)

3. an approximate calculation of quantity or degree or worth

e.g. an estimate of what it would cost
a rough idea how long it would take

Synonym: estimateestimationidea

4. an imprecise or incomplete account

e.g. newspapers gave only an approximation of the actual events