(astrology) A form of astrology that measures the position of the sun relative to the stars. This compensates for the precession of Earth's axis, which causes the zodiac signs to move around the sky relative to the vernal equinox.

(astronomy) The sidereal day of a planet. (I.e., in the definition for "sidereal day", replace "Earth" by the given planet.)

(astronomy) The sidereal year of a planet. (I.e., in the definition for "sidereal year", replace "Earth" by the given planet.)

(astronomy) sidereal orbital period / (astronomy) sidereal rotation period

plural of sidewalk superintendent

(typography) The margin of empty space around a glyph in a font, measured from the glyph contour's leftmost, rightmost, topmost and bottommost points to the sides of its bounding box

(US) A moving walkway.

(aviation) A flight manoeuvre that uses opposing rudder and aileron inputs to move the aircraft sideways without turning it.

(aviation) To perform a flight manoeuvre that moves the aircraft sideways without turning it.

plural of sidecar file