Picture someone brought in from outside and given one job: look at what is in front of you and say where it stands. A house — what is it worth? A candidate's practical test — did they reach the standard? A question the court cannot answer on its own — what does someone who actually works in that field say? The assessor is never the buyer, the candidate or the judge. They are the extra person whose whole role is the judgement itself, and what they produce is called an assessment.
From the word’s history
The supplied Wiktionary entry traces assessor through Middle English assessour and Old French to Latin assessor, glossed there as 'assistant judge; assessor of taxes'. Both of today's branches — sitting beside a court to advise, and putting a value on property for tax — were already inside the word before it reached English.
packet 裡的 Wiktionary 條目把 assessor 一路追到拉丁文的 assessor，並註明它同時指「助審的人」和「估稅的人」。也就是說，今天的兩條主線——坐在法庭旁邊提供專業意見，以及估出財產的價值來課稅——在這個字進入英語之前就都在裡面了。
Wiktionary entry 'assessor' (noun), source_ref kaikki:3f6f69a190036ae4:1332977860, supplied in this packet
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