(aviation, military) Pertaining to the ejection of the occupant of an aircraft from a grounded stationary position (i.e. zero altitude and zero airspeed).

The numeric symbol that represents the cardinal number zero. / The digit 0 in the decimal, binary, and all other base numbering systems. / (informal, uncountable) Nothing, or none.

(informal) no, not any / (meteorology) Of a cloud ceiling, limiting vision to 50 feet (15 meters) or less. / (meteorology) Of horizontal visibility, limited to 165 feet (50.3 meters) or less.

The cardinal number occurring before one and that denotes no quantity or amount at all, represented in Arabic numerals as 0.

(transitive) To set a measuring instrument to zero; to calibrate an instrument scale to valid zero.

To focus one's aim; to zoom in and center (on something). / To successfully narrow down a search (for). / To concentrate or focus one's attention (on a task). / (idiomatic) To converge (on).

simple past tense and past participle of zero. Cf. also zeroized.

plural of zero

Third-person singular simple present indicative form of zero

(rare) The decade of the 1800s, 1900s, 2000s, etc. The noughties. The 2000s.