Assessor

Part of speech: noun (n.)

1. 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. Mozley & W.

2. One who sits by another, as next in dignity, or as an assistant and adviser; an associate in office. Whence to his Son, The assessor of his throne, he thus began. Milton. With his ignorance, his inclinations, and his fancy, as his assessors in judgment. I. Taylor.

3. One appointed to assess persons or property for the purpose of taxation. Bouvier.