(geometry) A pair of angles that sum to a right angle.

(geometry) The three-dimensional analog of an angle, equivalent to the area of that portion of the surface of a unit sphere that it subtends.

(cinematography, photography) Of or pertaining to a short focal length lens that has an angle of view greater than about 70°; of or pertaining to an image produced with such a lens.

(obsolete, idiomatic) To beg out of a prison window with a cap, or box, let down at the end of a long string.

(geometry) An angle of 360 degrees; a full circle.

(geometry) the internal angles made by two (parallel) lines with a third, on opposite sides of it.

(aeronautics) The angle between the chord line of an airfoil and the airflow over it; one of the determiners of the amount of lift produced by an airfoil.

(optics, physics) The angle that a straight line, ray of light, etc., meeting a surface, makes with a normal to the surface at the point of meeting.

plural of right angle

(geometry) The inner angle between two sides of a polygon.