assessor

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An official who evaluates property for taxation.
• noun An assistant to a judge or magistrate, usually selected for special knowledge in a particular area.

from The Century Dictionary.

• noun One who sits by another; hence, one who shares another's position, rank, or dignity; an associate in office.
• noun An inferior officer of justice, who sits to assist a judge as a law authority; in Scotland, the legal adviser of a magistrate, with judicial powers.
• noun In England, a person chosen to assist the mayor and aldermen of a borough in matters concerning elections.
• noun In some universities, as the Scotch, the title of the elected members of the university court or supreme governing body of the university.
• noun One appointed to make assessments, especially for purposes of taxation.

from the GNU version of the Collaborative International Dictionary of English.

• noun One appointed or elected to assist a judge or magistrate with his special knowledge of the subject to be decided; as legal assessors, nautical assessors.
• noun One who sits by another, as next in dignity, or as an assistant and adviser; an associate in office.
• noun One appointed to assess persons or property for the purpose of taxation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One who assesses a property for tax or insurance evaluation.
• noun A specialist who assists the court in determining a matter.
• noun Tax assessor : Civil servant entrusted with checking the veracity of data and criteria used by a taxpayer to complete a tax return.
• noun One who assesses a project for cost evaluation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an official who evaluates property for the purpose of taxing it