Crossword Genius

Swearing-in words (3)

Ross

I believe the answer is:

ido

(Other definitions for ido that I've seen before include "See 1" , "Naturally, nobody speaks this" , "Artificial language" , "Say yes in marriage" , "Traditional affirmation to some marriage vows" .)

I've seen this clue in The Wall Street Journal and The New York Times.
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