Definition
To attach, append, or fasten one thing to another in a legally operative sense. The word carries two distinct legal meanings depending on context:
1. Documentary affixation: To attach, inscribe, or impress upon a legal instrument — such as a signature, seal, stamp, or mark — in a manner that gives the instrument legal effect. The act of affixing a seal to a deed, or a party's name to a contract, is not merely physical attachment but the act that authenticates or executes the document.
2. Real property affixation: To attach an item of personal property to real estate in such a manner, and under such circumstances, that it becomes a fixture — that is, part of the realty itself. Under this usage, a thing is considered affixed to land when it is attached by roots (trees, vines, shrubs), embedded within it (walls, foundations), or fastened to it permanently by physical means.
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Common Language
Modern common usage (Wiktionary): To attach; to subjoin or append to; to fix or fasten figuratively.
Historical common usage (Webster's 1913): To subjoin, annex, or add at the close or end; to fix or fasten in any way; to attach, unite, or connect with.
The common meaning of affix is broad and casual — taping a note to a wall "affixes" it in ordinary speech. In law, the word carries consequence. Affixing a seal or signature is a formal act of execution or authentication with binding legal effect. Affixing personal property to real estate triggers a body of doctrine governing ownership, financing, and severability that does not exist in the ordinary-language sense of the word.
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Recognized Forms
/SUBTYPES
Affix to an instrument: The attachment of a seal, signature, stamp, revenue mark, or trade-mark to a legal document. The mode and intent of affixation may determine the document's validity or the nature of the obligation created.
Affix to real estate (see FIXTURE): Personal property that has been so thoroughly attached to land or a structure that it loses its character as personal property and becomes part of the realty. Courts examine the method of attachment, the adaptation of the article to the use of the land, and the intent of the annexing party.
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Why It Matters in Research
The word affix is a gateway term to two distinct bodies of doctrine, and conflating them produces research errors. A researcher following a historical source that uses "affix" in the context of instruments should not assume fixture law is implicated, and vice versa.
In documentary contexts, the significance of affixation has shifted across time. Early common law treated the physical affixing of a wax seal as the operative act of execution for deeds and bonds — a signature alone was insufficient. Modern practice has largely displaced that requirement, but historical instruments must be read against the law of their era. A deed that recites "signed, sealed, and delivered" without an actual seal may have been defective when made, even if courts later treated a scroll or printed word as a sufficient seal substitute.
In real property research, affix and fixture are effectively synonymous in historical sources, but the legal test for what has been "affixed" sufficiently to become a fixture has varied by jurisdiction and has evolved over time. Bouvier's and Black's both defer to the FIXTURE entry — researchers should follow that cross-reference and not rely on the affix entry alone to understand the doctrine.
Trade-mark usage is a third, narrower context. Black's cites New York's Penal Code in connection with affixing trade-marks — a reminder that unauthorized affixation of a mark to goods was a criminal offense under early trade-mark statutes, not merely a civil wrong.
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Historical Dictionary Support
Bouvier confines the entry to a brief gloss — attach, append, annex, fasten, join — and redirects to FIXTURES for real property application. Anderson's entry is equally spare, pointing to FIXTURE and SEAL. Neither attempts a substantive treatment.
Black's is the most complete of the three, offering language drawn directly from New York's Penal Code and providing the three-part formulation for what counts as affixation to land: attachment by roots, embedding in the soil, or permanent fastening. This formulation tracks the common law test for fixture analysis and reflects standard doctrine of the era. Black's entry trails off mid-sentence in the available text, but the substance it does provide is reliable and consistent with the general law.
None of the three sources distinguishes between the documentary and real property senses with any precision. Researchers using these entries as a starting point should treat them as navigational pointers to FIXTURE and SEAL rather than as self-contained definitions.
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Jurisdictional Note
The test for whether an item has been "affixed" to realty sufficiently to become a fixture varies by jurisdiction. Some states emphasize physical attachment; others weight intent or adaptation to use more heavily. In commercial lending and secured transactions contexts, Article 9 of the Uniform Commercial Code governs priority disputes over goods affixed to real property and may displace common law fixture rules.
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