Definition
An angle that is neither a right angle (90°) nor a multiple of a right angle. In practice, any angle that is not 90°, 180°, 270°, or 360°.
Plain English
An angle that isn't a square corner. It's slanted — anything other than 90° or a flat straight line.
Context Anchor
Seen in aviation drawings, maintenance descriptions, and explanations of aircraft parts, flight paths, or forces that are not square to each other.
Derivation
From the Latin obliquus, meaning 'slanting' or 'sideways.' The word still carries that sense today — an oblique angle is a slanted, off-square angle.
Why Pilots Care
If a diagram or procedure describes something as oblique, the pilot or mechanic should not picture a square, 90-degree relationship. The direction or surface is slanted, which can affect how the drawing, force, or path is understood.
Intuition Check
Oblique does not mean opposite or backward here. It means slanted, not at a 90-degree angle.
Example Sentence 1
The repair diagram showed the stiffener meeting the rib at an oblique angle rather than square to it.
Example Sentence 2
The drawing showed the oblique angle used to mount the access panel.