Altitude is a term used to describe height above sea level. There are several other terms that are often used interchangeably with altitude. For example, elevation and height can be used to express the same meaning as altitude. Other synonyms for altitude include vertical distance, elevation above ground level, height above the Earth's surface, and altitude above sea level. It is important to be familiar with these synonyms as they are interchangeable terms used in various fields such as aviation, geography, and meteorology. Whether it is measuring the altitude of a mountain or calculating the altitude of a plane in flight, these synonyms for altitude are useful in communicating location or distance from sea level.