A deviation in mental function.

(optics) Deviation from the correct point of focus measured perpendicular to the axis.

(optics) Deviation from the correct point of focus measured parallel to the axis.

plural of planetary aberration

plural of annual aberration

plural of diurnal aberration

(astronomy) A deviation due to the Earth's orbital motion.

(astronomy) A deviation of where a planet appears to be, due to the motion of the planet during the time that the light reaches the Earth.

(astronomy) A deviation due to the earth's axial rotation.

(astronomy) A spurious circle around the true circle of the Sun.