Definition
Considered or measured in comparison to something else, rather than on its own. A quantity described as relative depends on a chosen reference point and changes if that reference changes.
Plain English
Compared to something. A relative value only makes sense once you know what it is being compared against.
Context Anchor
Pilots see this word in phrases where a value or direction depends on a reference, such as a position relative to the airplane, the runway, or another object.
Derivation
From the Latin relatus, meaning 'carried back' or 'referred to.' The idea is that the value is referred back to something else for its meaning. That fits aviation use: a relative measurement only has meaning when 'referred back' to a reference such as the aircraft, the air mass, or another point.
Why Pilots Care
Many aviation measurements are relative, not absolute. Misreading a relative value as an absolute one (or comparing it against the wrong reference) leads to navigation errors, misjudged wind, and incorrect altitude awareness.
Analogy
Saying “the fuel truck is to my left” is relative to you. If another person is facing the opposite way, the truck may be to their right.
Intuition Check
Relative does not mean vague or approximate here. It means the statement depends on a stated or understood reference point.
Example Sentence 1
The relative bearing to the station is 030 degrees, measured from the nose of the aircraft.
Example Sentence 2
The relative bearing to the airport changed as the airplane turned onto the downwind leg.