Cold temperatures of approximately zero degrees. / The property of a casting having no chill (hardened surface). / (informal) Lack of any good qualities.

(linguistics) The derivation of a word from another word (of a differing part of speech) without modification; anthimeria.

plural of zero suffix

(linguistic morphology) A suffix which is a null morpheme, used in models of linguistic analysis to represent the lack of a suffix where one might otherwise be expected (for example, as one of several inflections that a stem can take, or the reduction of a historically vocalised suffix to the point that it is inaudible).

plural of zero prefix

(UK, telephony) The digit 0 that begins all telephone numbers in the United Kingdom, which is substituted for the country code in the event of international calls.

Having zero cases of COVID-19. / A strategy designed or intended to eliminate or completely exclude COVID-19.

(machine learning, attributive) Performing without specialized training data.

(physics, quantum mechanics) The lowest possible energy of a given quantum mechanical system.

(game theory) A game (or a similar political or economic system) in which the gains of some players must equal the losses of others.