Dictionary entry overview: What does mirror mean? • MIRROR (noun) The noun MIRROR has 2 senses: 1. polished surface that forms images by reflecting light 2. a faithful depiction or reflection Familiarity information: MIRROR used as a noun is rare. • MIRROR (verb) The verb MIRROR has 2 senses: 1. reflect as if in a mirror 2. reflect or resemble Familiarity information: MIRROR used as a verb is rare.