Speak in absolute terms (5)
I believe the answer is:
utter
'speak' is the definition.
(I know that speak can be written as utter)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for utter that I've seen before include "Positive" , "Say the words" , "Absolutely" , "Make sounds (but not necessarily words)" , "Complete; absolute" .)