Relating to an assessor or the duties and functions of assessing and evaluation.
From assessor (one who assesses, from Latin assessor) + -ial (adjectival suffix meaning 'relating to'). The Latin assessor meant 'one who sits beside' (as a judge's assistant), derived from assidere.
The word 'assessor' has come full circle: originally it meant a judge's helper who sat beside them, but now assessors are independent professionals evaluating property values and tax liability. The assessorial function has become its own specialized career!
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