In topology, a covering or covering projection is a surjective map between topological spaces that, intuitively, locally acts like a projection of multiple copies of a space onto itself.
In mathematics, and more particularly in set theory, a cover of a set X {\displaystyle X} is a family of subsets of X {\displaystyle X} whose union is all of X {\displaystyle X}.
A cover in foreign, military or police human intelligence or counterintelligence is the ostensible identity and/or role or position in an infiltrated organization assumed by a covert agent during a covert operation.
In philately, the term cover pertains to the outside of an envelope or package with an address, typically with postage stamps that have been cancelled and is a term generally used among stamp and postal history collectors.
Cover is a term used in the law of contracts to describe a remedy available to a buyer who has received an anticipatory repudiation of a contract for the receipt of goods.
En la luktosportoj de frapo, la kovro estas movo de defendo permesanta protekti sin de atako per lokigado de armilo aŭ de parto de la korpo sur la celata celo de tiu ĉi atako.
In telecommunications and tradecraft, cover is the technique of concealing or altering the characteristics of communications patterns for the purpose of denying an unauthorized receiver information that would be of value.
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