Definitions from Wiktionary ( )

▸ noun:  The numeric symbol that represents the cardinal number zero.
▸ noun:  The digit 0 in the decimal, binary, and all other base numbering systems.
▸ noun:  (informal, uncountable) Nothing, or none.
▸ noun:  The value of a magnitude corresponding to the cardinal number zero.
▸ noun:  The point on a scale at which numbering or measurement originates.
▸ noun:  (mathematics) A value of the independent variables of a function, for which the function is equal to zero.
▸ noun:  (mathematics, algebra) The additive identity element of a monoid or greater algebraic structure, particularly a group or ring.
▸ noun:  (slang) A person of little or no importance.
▸ noun:  (military) A Mitsubishi A6M Zero, a long range fighter aircraft operated by the Japanese Navy Air Service from 1940 to 1945.
▸ noun:  A setting of calibrated instruments such as a firearm, corresponding to a zero value.
▸ noun:  (finance) A security which has a zero coupon (paying no periodic interest).
▸ adjective:  (meteorology) Of a cloud ceiling, limiting vision to 50 feet (15 meters) or less.
▸ adjective:  (meteorology) Of horizontal visibility, limited to 165 feet (50.3 meters) or less.
▸ adjective:  (linguistics) Present at an abstract level, but not realized in the surface form.
▸ verb:  (transitive) To set some amount to be zero.
▸ verb:  To disappear or make something disappear.
▸ verb:  to adjust until the variance is reduced to an acceptable low amount

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