[noun] a natural object that covers or envelops; "under a covering of dust"; "the fox was flushed from its cover" Synonyms:natural cover
[noun] an artifact that covers something else (usually to protect or shelter or conceal it)
[noun] the act of concealing the existence of something by obstructing the view of it; "the cover concealed their guns from enemy aircraft" Synonyms:cover, screening, masking
[noun] the act of protecting something by covering it
[noun] the work of applying something; "the doctor prescribed a topical application of iodine"; "a complete bleach requires several applications"; "the surface was ready for a coating of paint"; Synonyms:application, coating