From Longman Dictionary of Contemporary Englishassessoras‧ses‧sor /əˈsesə $ -ər/ noun [countable] 1 COUNT/CALCULATEsomeone whose job is to calculate the value of something or the amount of tax someone should pay2 SE British English someone who decides how well someone has done in an examination SYN examiner3 KNOW somebodysomeone who knows a lot about a subject or activity and who advises a judge or an official committee
Examples from the Corpus
assessor• But a good rating from the independent assessors can make all the difference.• a property assessor• The new organisation's assessors will conduct local visits and will gather information on patients' experience of the doctor's service.• Only the tax assessor noted their existence.• He is assisted by two or more technical assessors also appointed by the Lord Chancellor.• For this reason, a mechanism must be built to ensure that assessors can be monitored and supported.From Longman Business Dictionaryassessoras‧ses‧sor /əˈsesə-ər/ noun [countable]1JOBsomeone whose job is to examine places, systems, or people to decide how good or suitable they areI worked for a travel agency as an assessor of foreign locations.2PROPERTY someone whose job is to assess the value of houses or other buildings to calculate how much tax the people who own them must payIt is the Regional Assessor who determines the tax band for the property.3INSURANCE a person or company whose job is to assess the value of loss or damage for someone who has made an insurance claimSYNCLAIMS ADJUSTER, INSURANCE ADJUSTER, LOSS ADJUSTERHer car was still in the garage waiting for a visit from the insurance assessor.4LAW someone who helps a judge in a court of law by advising them on technical or scientific matters, or on other matters on which special knowledge is needed 