(1):
(n.) A light-producing vessel, instrument or apparatus; especially, a vessel with a wick used for the combustion of oil or other inflammable liquid, for the purpose of producing artificial light.
(2):
(n.) A thin plate or lamina.
(3):
(n.) Figuratively, anything which enlightens intellectually or morally; anything regarded metaphorically a performing the uses of a lamp.
(4):
(n.) A device or mechanism for producing light by electricity. See Incandescent lamp, under Incandescent.