1. A value, estimate, or representation that is close to but not exactly the same as something else.
Usage: Usually plural; refers to multiple estimates or rough versions of something
2. In mathematics and science, a simplified or rounded value used when an exact answer is difficult or unnecessary to obtain.
Usage: technical/academic

Examples

• The architect provided several approximations of the building's final cost before construction began.
• These approximations are close enough for our purposes, even if they aren't perfectly accurate.
• In physics, we often use approximations to simplify complex equations.
• The weather forecast gives approximations of tomorrow's temperature, not exact predictions.
• Early approximations of Earth's circumference were surprisingly close to the actual measurement.
• The engineer made rough approximations of the material needed for the project.