Assessor \As*sess"or\, n. [L., one who sits beside, the assistant of a judge, fr. assid?re. See Assession. LL., one who arranges of determines the taxes, fr. assid?re. See Assess, v., and cf. Cessor.]

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.

Source: Webster's Revised Unabridged Dictionary (1913)