atmospheric air specially cleaned so that it contains less than 0.1 ppm of hydrocarbon impurities; it then is usable in laboratory procedures such as versions of gas chromatography in which sufficiently pure air may serve as a carrier gas.

(usually used attributively, finance) A non-existent coupon. / (finance) A financial security that does not pay interest periodically.

(computing, idiomatic) (of vulnerability) newly discovered, and therefore still not fixed and possibly exploited by hackers or other criminals

(computing, idiomatic) vulnerability that has been discovered recently, and is yet unpatched or unmitigated; zero-day vulnerability

(mathematics, of a function) Being equal to the zero function and not merely zero at a particular point in its domain.

plural of zero conditional

(language education, grammar) A structure used to talk about general truths or facts, containing an "if" clause (with a verb in the present tense) and a main clause (with a verb in the present tense).

(of cattle) Kept in enclosures and never let out to graze.

plural of ground zero

Alternative form of zero G