(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

A zone surrounding a metropolitan area or city from which commuters travel to the area or city to work.

(New Age) A mythical dangerous belt of photons emanating from the Pleiades that will collide with the Earth in the near future according to New Age mystics.

Alternative letter-case form of Kuiper belt

A restraining belt attached to a vehicle seat and fastened around occupants in order to keep them in place and decelerate them smoothly rather than suddenly in an accident, mitigating the risk of injury from uncontrolled impact with injurious objects.

a belt made from wampum beads

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.

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

(boxing) Of a punch, landing illegally, below the opponent's waist. / (by extension, idiomatic) Unfair; dirty; not according to the generally accepted rules.