(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

(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

(computing) A file that stores data, such as metadata, which is not supported by the source file format.

artwork on the side of an arcade game cabinet.