More absolute; comparative form indicating greater degree of absoluteness, completeness, or unconditional nature.
From absolute plus -er (English comparative suffix), though modern grammarians debate whether 'more absolute' is standard since absolute is traditionally seen as non-gradable. Medieval and early modern texts use it freely.
Grammatically, absoluter shouldn't work because you can't have degrees of 'complete'—yet poets and philosophers have always used it, treating absoluteness as a scale anyway, showing how logic loses to expressive need.
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