Full record for UFO n.

Definition an unidentified flying object; a ‘flying saucer’
OED requirements antedating 1953
Earliest cite D. E. Keyhoe in 'Air Line Pilot' Oct.
Last modified 6 July, 2008

Citations for UFO n.

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1968 D.C. Fontana Tomorrow is Yesterday in J. Blish Star Trek 2 (1968) 28 We're tracking both you and the UFO.
1989 Omni Aug. 81/2 It somebody asked me how to make a tiny town nobody has ever heard of internationally famous, I'd say, ‘Announce that you're going to build a landing site for UFOs.’
1991 A. D. Foster Cat.a.lyst xii. 180 An invasion! Real UFOs!
1992 Sci. Fiction Age Nov. 18/2 A wave of UFO and radioactive mutant films followed.
1993 SFRA Rev. Jan. 37 Brosnan doubts the conventional wisdom that every monster, alien, and UFO in 1950s films represented either nuclear weapons or Communism.
1993 Omni Oct. 113/1 The youngster began a lifelong quest to learn about UFOs.
1995 C. Carter Truth is out There: Official Guide to The X Files The Episodes: Season 1 138 Synopsis: An Iraqi pilot shoots down a UFO, which crashes near a U.S. installation along the Iraq/Turkey border.
1995 C. Carter Truth is out There: Official Guide to The X Files The Episodes: Season 1 102 Later they see two darting lights in the night sky, then go to the Flying Saucer Cafe—looking for ‘UFO nuts’—where Mulder sees a picture of a UFO that looks uncannily like a shot supposedly taken in Roswell, New Mexico in 1947.
1995 C. Carter Truth is out There: Official Guide to The X Files Conception and Evolution 15 ‘I read it, and I thought it was a really good story and that UFOs [(unidentified flying objects)] would get boring after three or four episodes,’ Duchovny recalls. ‘I thought I could go to Vancouver for a month and get paid, and then go on and do my next movie.’
1995 C. Carter Truth is out There: Official Guide to The X Files Introd. 2 Though the pilot and the first episode dealt with UFOs [(unidentified flying objects)] , the series quickly established itself as one that was going to deal with a wide array of topics.