LekhoriLekhoripresent participle and gerund of cover
That which covers or conceals; a cover; something spread or laid over or wrapped about another.
Face covering is also mentioned: "There are some circumstances when wearing a face covering may be marginally beneficial as a precautionary measure. The evidence suggests that wearing a face covering does not protect you, but it may protect others if you are infected but have not yet developed symptoms. [...] If you can, wear a face covering if you need to use public transport."
Action of the verb to cover.
A collection of sets U_i such that their union contains U; such a collection with the additional property that every U_i is open; such a collection with the additional property that every U_i is contained in U.
Present participle or participial adjective from cover (verb) + -ing; or, from Middle English coverynge, participle form of coveren, keveren (“to cover”).
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