Speak in absolute terms (5)

I believe the answer is:

utter

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'speak' is the definition.
(I know that speak can be written as utter)

I don't understand the remainder of the clue.

(Other definitions for utter that I've seen before include "Positive" , "Say the words" , "Absolutely" , "Make sounds (but not necessarily words)" , "Complete; absolute" .)

I've seen this clue in the Evening Standard.

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