noun

• (astronomy) The distance of a celestial object above the horizon, or the arc of a vertical circle intercepted between it and the horizon; altitude.
  "the elevation of the pole, or of a star"
• (architecture) A geometrical projection of a building, or other object, on a plane perpendicular to the horizon; orthographic projection on a vertical plane; called by the ancients the orthography.
• (Christianity, chiefly Roman Catholicism) The raising of the host—representing Christ’s body—in a mass or Holy Communion service.
• (UK, obsolete, uncountable) An opium mixture used in the Fens to improve the mood and prevent malaria.
  "[…] many of the fen people used what they called "elevation." Farmer Porter was his informant concerning this habit. "What's elevation?" "Oh! ho! ho! — yow goo into druggist's shop o' market day into Cambridge, and you'll see the little boxes, doozens and doozens, a' ready on the counter; and never a ven-man's wife goo by, but what calls in for her pennord o' elevation, to last her out the week. […]"