Terse acknowledgment (3)

I believe the answer is:

ido

(Other definitions for ido that I've seen before include "Required affirmative in wedding ceremony" , "Marriage response" , "a language? That's unnatural" , "Naturally, nobody speaks this" , "Wedding vow" .)

I've seen this clue in the Newsday.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.