ESPERANTO

Set to 4 different clues across 4 published puzzles, most often “The 1965 William Shatner film "Incubus" is in it” — The New York Times, Saturday, 18 April 2009.

9 letters

Every clue on record, most used first

The 1965 William Shatner film "Incubus" is in itonce
The New York Times — Saturday, 18 April 2009
Language in which plurals are formed by adding -ojonce
The New York Times — Tuesday, 24 July 2007
Lingua franca, for someonce
The New York Times — Friday, 14 March 1997
"Saluton! Kiel vi fartas?," e.g.once
The New York Times — Friday, 16 August 1996