Source : Webster's Revised Unabridged Dictionary (1913)

Flier \Fli"er\, n.
   An a["e]roplane or flying machine.

Flier \Fli"er\ (fl[imac]"[~e]r), n. [Form {Fly}, v.; cf.
   {Flyer}]
   1. One who flies or flees; a runaway; a fugitive. --Shak.

   2. (Mach.) A fly. See {Fly}, n., 9, and 13
      (b) .

   3. (Spinning) See {Flyer}, n., 5.

   4. (Arch.) See {Flyer}, n., 4.

Source : WordNet®

flier
     n 1: someone who travels by air [syn: {flyer}]
     2: someone who operates an aircraft [syn: {aviator}, {aeronaut},
         {airman}, {flyer}]
     3: an advertisement (usually printed on a page or in a leaflet)
        intended for wide distribution; "he mailed the circular to
        all subscribers" [syn: {circular}, {handbill}, {bill}, {broadside},
         {broadsheet}, {flyer}, {throwaway}]