A person who assesses or evaluates something together with another assessor.
From 'co-' (together) and 'assessor' (one who assesses), from Latin 'assessare' meaning 'to sit beside.' The original meaning literally meant 'one who sits beside' a judge or official.
Assessor comes from Latin for 'sitting beside,' because court officials literally sat next to judges to help—language preserves this ancient job description even though nobody sits beside judges anymore!
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