Definition
A note, comment, or explanatory remark appended to a legal text, statute, case, or other document to clarify, interpret, or supplement its meaning. In legal research, the term carries several distinct but related meanings:
1. Statutory annotation. Notes appended to codified statutes identifying cases that have interpreted or applied the statute, along with references to secondary sources, cross-references to related provisions, and editorial commentary. Annotated codes — such as the United States Code Annotated (U.S.C.A.) or United States Code Service (U.S.C.S.) — derive their name from this function.
2. Case annotation (A.L.R. annotation). A structured essay published in American Law Reports (A.L.R.) collecting and analyzing all significant cases on a specific legal point. A.L.R. annotations are not merely case digests; they synthesize judicial decisions across jurisdictions around a narrow issue and remain among the most efficient tools for comprehensive case-law research.
3. Civil law (historical). In Roman and early civil law, an annotation referred to an imperial rescript — the written response of the emperor to a legal question submitted by a private party. It also carried the meaning of summoning an absentee or designating a place of deportation.
4. General scholarly use. Any marginal or appended note added to a text to explain, criticize, or contextualize its contents.
Common Language
Modern common usage (Wiktionary): A critical or explanatory commentary or analysis; a comment added to a text; metadata added to a document or program; information relating to genetic structure.
Historical common usage (Webster's 1913): A note added by way of comment or explanation, usually in the plural; as, annotations on ancient authors.
The common meaning and legal meaning overlap substantially — both involve explanatory notes appended to a text. The gap that matters for researchers is one of scale and function: in legal research, an annotation is not simply a marginal gloss but often a full-scale secondary source organizing entire bodies of case law around a discrete legal question. A researcher who treats an A.L.R. annotation as a mere footnote has misunderstood the resource.
Recognized Forms
/SUBTYPES
Statutory annotation: Editor-supplied notes in an annotated code identifying cases, law review references, and cross-references for each statutory provision.
A.L.R. annotation: A research essay in American Law Reports collecting, organizing, and analyzing cases across jurisdictions on a specific legal issue. Published in series: A.L.R., A.L.R.2d through A.L.R.7th, and A.L.R. Federal.
Imperial rescript (civil law): The historical Roman usage — the emperor's written response to a private legal inquiry, having the force of law.
Judicial annotation: In some commonwealth and civil law jurisdictions, notes appended to reported judgments by editors or compilers explaining procedural posture or cross-referencing prior decisions.
Why It Matters in Research
The term annotation is a navigational term as much as a substantive one, and researchers must track which sense is in play.
For statutory research, the distinction between an unannotated code and an annotated code is critical. Unannotated official codes (such as the U.S.C.) contain the text of the law; annotated codes add the research apparatus — case notes, cross-references, and commentary — that makes the statute usable as a research tool. When reading historical materials, researchers should note that the depth and reliability of statutory annotations have varied considerably across editions and publishers.
For case-law research, A.L.R. annotations are underused relative to their value. Because each annotation collects cases on a narrow point from multiple jurisdictions, they compress what could be hours of digested searching into a single curated source. Researchers working in the Law Mind corpus should be alert to the fact that A.L.R. annotations are periodically supplemented or superseded; an annotation's current validity must always be confirmed, and earlier series annotations may reflect case law that has since shifted significantly.
For historical legal research, the civil law meaning of annotation (imperial rescript) appears in Roman law sources, Justinian's Digest, and works of civilian scholars. A researcher encountering annotation in a pre-modern civil law text should not import the modern statutory or A.L.R. meaning; the term there signals a category of imperial legislative action, not an editorial gloss.
The term also appears in modern computational and legislative contexts — XML markup of legal texts, machine-readable legislative data — where annotation refers to structured metadata rather than prose commentary. This usage is increasingly relevant for legal data research and has no direct counterpart in the classical legal dictionaries.
Historical Dictionary Support
Both editions of Black's Law Dictionary agree closely on the definition, drawing on Webster for the general sense ("a remark, note, or commentary on some passage of a book, intended to illustrate its meaning") before turning to the civil law senses. Both editions identify the same Roman law meanings: the imperial rescript, the response to private legal inquiries, the summoning of an absentee, and the designation of a place of deportation, citing the Digest (Dig. 1, 5 and Dig. 32, 1, 3).
What the historical dictionaries do not address is the distinctly American development of the A.L.R. annotation as a major secondary research tool, which postdates both editions, and the rise of annotated statutory codes as the dominant format for legislative publication. These are the meanings most likely to be encountered by researchers working in modern legal materials, and the historical dictionaries are silent on both. Researchers relying solely on Black's for this term will have an incomplete picture of how annotation functions in contemporary legal research.
Jurisdictional Note
The A.L.R. annotation format is primarily a feature of American legal publishing. Commonwealth jurisdictions have analogous editorial apparatus in their law reports, but the structured A.L.R.-style annotation collecting multi-jurisdictional cases around a single issue is distinctly American. Civil law jurisdictions retain traces of the Roman annotation concept in their scholarly apparatus, though the term's usage varies by national legal tradition.