Three-tone chord (5)

I believe the answer is:

triad

(Other definitions for triad that I've seen before include "Up to date" , "Could be major" , "Chinese secret society" , "Chinese criminal society" , "Criminals" .)

I've seen this clue in the Universal and the LA Times.

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.