noun

1. Someone who fits a lining to something.

   “1973, A good liner has a pretty shrewd idea of the value of the painting he is treating and usually charges accordingly. — Kyril Bonfiglioli, Don't Point That Thing at Me (Penguin 2001, p. 41)”

2. A removable cover or lining

   “I threw out the trash can liner.”

3. The pamphlet which is contained inside an album of music or movie

   “Does it have the lyrics in the liner notes?”