(chiefly Britain) subject to no value-added tax when sold (but the supplier can still recover VAT attributable to it)

simple past tense and past participle of zero-rate

Originally, the point on the land or water surface below which a nuclear bomb detonates in the air; now also the point on such a surface at or above the detonation.

(of a temperature) below 0°C; freezing cold

Alternative spelling of nonzero

(firearms) The adjustment of a sight, exactly parallel to the axis of the bore of the gun to which it is attached.

(geometry) Having zero dimensions; having no extent in any direction.

The start of the first hour of the day on the 24-hour clock, i.e. 0:00, military time.

(military) The location of the center of a burst of a nuclear weapon at the instant of detonation. The zero point may be in the air, or on or beneath the surface of land or water, depending upon the type of burst, and it is thus to be distinguished from ground zero.

(physics) associated with zero on any scale, but particularly with a temperature of absolute zero