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UFP Historical Society
First Appearance TOS08 (15 Sep 1966)
Prime Timeline
(The root of all realities)

An ancient term dating back to the mid-twentieth century on Earth,[1] "four-oh," or "4-0," meant that someone was physically fit. When Charlie Evans didn't understand the term, Dr. McCoy explained it as "One hundred percent. Sound of wind and limb."[2]

Notes and References

  1. The slang term "4-0" was widely used in the 1940s and later decades, such as the 1960s when the episode was written.
  2. Roddenberry, Gene (Executive Producer). "Charlie X". Star Trek, season 1, episode 2 (Production number 08). Directed by Lawrence Dobkin. Story by Gene Roddenberry. Teleplay by D.C. Fontana. Desilu Productions. 15 September 1966.