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

Alternative spelling of nonzero

(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.

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

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

(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.

The state of apparent weightlessness which occurs in a very low gravity field, or in free fall.

(US) The smallest size of women's clothing / (informal) A woman with a very low body mass index, especially such a fashion model

A tensor with all entries equal to zero; where any pattern of covariant and contravariant indices have all components equal to 0. / A generalization of the zero vector to tensor space.