Relating to or connected with assessment or evaluation, especially in legal or tax matters; an archaic term.
From assession + -ary (adjectival suffix meaning 'relating to' or 'connected with'). This is a rare formation that combines the Latin-derived assession with English derivational morphology.
This is an extremely rare word—you probably won't find it in modern dictionaries! It represents the kind of archaic legal jargon that flourished in medieval documents but disappeared as simpler terms like 'assessment' became standard. It's a linguistic dinosaur.
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