Relating to or assisting in assessment; connected with the process of evaluating or determining value.
From assess + -ory (adjectival suffix meaning 'relating to' or 'serving to'). The -ory suffix creates adjectives from verbs (like 'sensory' from 'sense' or 'advisory' from 'advise').
Assessory is a relative rarity—most people use 'assessment-related' or 'assessment' as an adjective instead. But in formal legal or administrative writing, 'assessory functions' or 'assessory powers' precisely describes roles that assist in evaluation.
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