Definition
Persons appointed or elected to perform the function of assessment — most commonly the valuation of real property for purposes of taxation. In modern American usage, the assessor (or board of assessors) is typically a local government officer responsible for determining the taxable value of land and improvements within a jurisdiction. The office is usually created by statute and may be elective or appointive depending on the jurisdiction.
The term carries a secondary, historically significant meaning in civil law systems: persons learned in the law who sat beside and advised judges of inferior courts, supplying legal expertise the judge might lack. This advisory role was distinct from that of a juror or co-judge; the assessor guided but did not decide.
Common Language
Modern common usage (Wiktionary): Plural of assessor — persons who assess or evaluate something.
Historical common usage (Webster's 1913): One appointed to assess persons or property for the purpose of taxation; also, one who sits beside another to assist.
Editorial note: The common meaning captures both functions well enough that a non-specialist reader will not be badly misled, but the civil law advisory role — assessors as legal advisors to judges — has essentially vanished from ordinary usage. A researcher encountering "assessors" in a civil law or early ecclesiastical law context who reads only the tax-valuation meaning will misread the source entirely.
Recognized Forms
/SUBTYPES
Tax Assessors: The dominant modern form. Officers of local government who value real and sometimes personal property to establish the tax base. May sit individually or as a board of assessors.
Civil Law Assessors (Assessores): In Roman, continental, and Scots law, legally trained advisers attached to a judge. Their function was consultative; final judgment remained with the judge. Bouvier cites the Digest (1.22) and Code (1.51) as the foundational sources.
Why It Matters in Research
The two meanings of this term occupy almost entirely separate bodies of law and literature, and conflating them is an easy mistake when working across historical periods or legal systems.
In American primary sources from the colonial period through the nineteenth century, assessors appear in two distinct contexts: local revenue administration (tax rolls, assessment appeals, municipal records) and, occasionally, in early procedural texts borrowing from civil law tradition. A researcher tracing property tax law will find the term stable and consistent. A researcher working in admiralty, ecclesiastical, or early civil practice may encounter assessors in the advisory-judge sense, where the term signals a very different institutional structure.
Bouvier's entry is brief and points directly to the civil law sources — the Digest and the Code — without developing the American tax-assessment function in any detail. This reflects the period of the dictionary's composition; later editions and successor dictionaries devote considerably more space to the public-officer meaning as American municipal government formalized.
In Scots law, the assessor tradition persisted longer than in most common law jurisdictions, and Bell's Dictionary (cited by Bouvier) remains a useful entry point for that lineage. Researchers working with Scottish legal history or comparative law materials should keep this distinct thread in view.
Jurisdictional variation in the tax-assessor function is substantial in practice — the office's powers, the standards for valuation, and the appeals process differ state by state — but the basic institutional identity of the assessor as a property-valuation officer is consistent across American jurisdictions.
Historical Dictionary Support
Bouvier's entry is spare: two sentences covering the two meanings, with citations to Bell and to the Roman law texts. It is honest about the civil law meaning but says almost nothing about the American public-officer function that would have been the working reality for most of Bouvier's readers. This gap likely reflects the dictionary's design as a reference for practitioners who already understood local assessment law and needed help with the doctrinal or civil-law dimension.
The Roman law citations Bouvier provides — Digest 1.22 (De officio assessorum) and Codex 1.51 — are the authoritative sources on the civil law assessor and remain directly accessible. Any researcher who needs to go deeper on the advisory-judge function should consult those texts directly rather than relying on Bouvier's summary.
No significant disagreement exists among historical dictionaries on these meanings; the civil law tradition is well-settled, and the tax-administration meaning is too practically grounded to generate doctrinal controversy at the definitional level.
Jurisdictional Note
In the United States, the assessor's office is a creature of state law, and the office's powers, the standards of valuation, and the structure of assessment appeals vary considerably by state. Some states use elected county assessors; others use appointed boards. Researchers should identify the governing state statute before drawing conclusions from secondary sources that may reflect a different jurisdiction's model.
Encyclopedia Cross-Reference
Law Mind Encyclopedia — Taxation
Law Mind Encyclopedia — Local Government
Law Mind Encyclopedia — Civil Law Systems