Definition
A last will is a legal instrument by which a person (the testator) directs the disposition of their property upon death. The document takes effect only at death, may be revoked or amended at any time before death while the testator has capacity, and must generally satisfy formal execution requirements — typically including writing, signature, and witness attestation — to be valid.
The phrase "last will and testament" is the traditional full form of the instrument. In modern usage, "last will," "will," and "last will and testament" are treated as interchangeable and refer to the same document. Historically, the two components of the phrase carried distinct meanings: "will" was the term associated with the disposition of real property (lands and tenements), while "testament" referred to disposition of personal property (chattels). That distinction has been functionally obsolete for centuries, but the combined phrase persists as a drafting convention.
Common Language
Modern common usage (Wiktionary): A synonym of testament; a document expressing a person's wishes for the distribution of their property after death.
Historical common usage (Webster's 1913): Webster's 1913 defines "will" broadly as volition and desire, with the testamentary instrument sense as a secondary meaning — "the legal declaration of a person's wishes as to the disposal of his property after his death."
The gap between common and legal meaning here is narrow but worth noting. In ordinary speech, people often treat "last will" as a solemn or even poetic phrase meaning final wishes broadly — including personal instructions, letters, or informal directions. In law, the term is confined to a formal instrument satisfying prescribed execution requirements. An informal document expressing "final wishes" carries no legal force as a will unless it meets those requirements.
Common Confusion
LAST WILL vs. CODICIL: A codicil is an amendment or supplement to an existing will, not a separate will. Researchers encountering both terms in an estate file should treat the will and all codicils together as constituting the full testamentary scheme.
LAST WILL vs. LIVING WILL: These are entirely distinct instruments. A living will (also called an advance directive or healthcare directive) expresses wishes about medical treatment during life, not property disposition at death. The shared word "will" causes frequent confusion in non-legal contexts. Historical sources predate the living will as a legal category and will not address this distinction.
LAST WILL vs. TESTAMENT: In historical sources, these terms sometimes appear as meaningfully distinct (will for realty, testament for personalty). In modern law and drafting, they are synonymous. See Historical Dictionary Support below.
Why It Matters in Research
The real/personal property distinction between "will" and "testament" is historically significant and can affect how older cases and commentaries are indexed. Pre-19th century English sources, and some early American sources, may discuss the two instruments under separate headings. A researcher examining probate disputes over land in early materials should check both "will" and "testament" as index terms, since the applicable rules — including which court had jurisdiction (ecclesiastical courts for personalty, common law courts for realty in England) — differed based on subject matter.
The phrase "last will and testament" reflects this dual heritage. Drafters combined the terms to ensure comprehensive coverage of both real and personal property in a single instrument. When this combined phrase appears in historical documents, it signals an intent to govern both realty and personalty, which was not self-evident from either word alone in older legal systems.
Modern corpus researchers should also note that the word "last" in "last will" is functional, not merely rhetorical. Where multiple testamentary instruments exist, the last duly executed will controls, and earlier wills are revoked unless expressly incorporated. Research into contested estates may require tracing a sequence of instruments to identify which governs.
Historical Dictionary Support
Black's Law Dictionary and Burrill's Law Dictionary are in full agreement on this entry, and both trace the distinction directly to Lord Coke's Commentaries on Littleton (Co. Litt. 111a). Coke's authority on this point was settled enough that both dictionaries simply restate it without qualification.
Both sources also agree — and this is the more practically useful point — that the distinction had already collapsed into convention by the time they were writing. The combined phrase "my last will and testament" had become standard drafting language describing a single instrument governing both types of property. Neither dictionary flags any surviving legal consequence from the historical distinction, and neither should a modern researcher expect one.
What the historical dictionaries do not address: execution formalities, capacity requirements, revocation, the role of attestation, or the distinction between holographic and formally witnessed wills. These subjects require sources beyond a dictionary entry — treatises, statutes, and case law specific to jurisdiction and time period.
Jurisdictional Note
Execution requirements for a valid will vary by jurisdiction. Most U.S. states follow a two-witness attestation model derived from the English Statute of Frauds and Statute of Wills, but a significant number also recognize holographic wills (handwritten and signed by the testator, without witnesses). Some jurisdictions have adopted the Uniform Probate Code, which relaxes formal requirements under a harmless error or substantial compliance doctrine. Researchers working across jurisdictions should not assume uniform rules.