a part of an internal combustion engine that controls the timing of the engine's valves.

(astronomy) A region of space between 30 and 50 astronomical units from the Sun, roughly confined within a thick band around the ecliptic of the Solar System. This area is populated by many thousands of trans-Neptunian objects.

(astronomy) a type of asteroid belt found in the outer regions of planetary systems that forms an annular belt or disc around the system's center, lying beyond the planetary formation region for major planets, which may extend outwards to reach the inner Oort cloud

(informal) A reduction in expenditure as a result of financial restrictions

A method of power transmission by means of belts that connect pulleys on shafts

(US, southern) A geographic region where the residents are predominantly or exclusively African-American.

(martial arts) The highest belt colour in various martial arts. / (martial arts) Someone who has attained the black belt in martial arts. / (figuratively, colloquial) Great skill in any field.

Redundant systems, affording mutual backup in the event of one failing.

A belt-like garment, designed to be worn over the genitals and locked to prevent sexual intercourse, typically for long periods of time, to maintain chastity, prevent masturbation, or to enforce BDSM submission.

A belt or strap that attaches a person to an immovable object for safety. / A life belt. / A seat belt.