B1[C]something that is put on or over something else, usually to protect it, to keep something in, etc.: I keep my computer printer under a protective plastic cover.Remove the packaging and pierce the film cover before microwaving.Coverings and layersB1[C]the stiff outside part of a book or magazine, usually made of thick paper or cardboard: Who should we put on the cover of the magazine this month?Paperback books have soft covers.Books and parts of booksread sth from cover to cover›to read a book, magazine, etc. all the way through from the beginning to the endComplete and wholeVery and extreme›[C]Indian Englishan envelopesend sth under plain/separate coverformal›to send something in a plain/separate envelopeThe postal systemcovers[plural]›the blankets, sheets, etc. on a bed: Martha threw back the covers and bounced out of bed.Bed linen and covers