I ALWAYS 
say tertiary 
I think I like the way it sounds better 
it's the color theory
I used for
my religious painting
in highschool 
purple, orange, green
I did karmic wheels
BUT 
I mis-spoke the tertiary 
if I EVER say tertiary 
& it's important 
BETTER 
to check
because it usually takes me a while 
to catch my error