Definition
Causa mortis is a Latin phrase meaning "because of death" or "in anticipation of death." In law, it functions almost exclusively as a modifier describing an act — most commonly a gift — made by a person who believes death is imminent. The phrase does not name a standalone legal concept but qualifies the circumstances under which a transfer occurs, signaling that the donor acted under the apprehension of a specific, impending death rather than in the ordinary course of life.
The term appears almost always in the compound phrase donatio causa mortis (gift in contemplation of death), the common-law doctrine governing transfers of personal property made under such circumstances. A gift causa mortis is conditional: if the donor recovers, or if the donee dies first, the gift is revoked by operation of law and the property returns to the donor or donor's estate.
Common Confusion
Causa mortis is routinely encountered alongside inter vivos, and the contrast between the two is the most important doctrinal line in gift law. An inter vivos gift is made between living persons with no anticipation of imminent death; it is absolute and irrevocable upon delivery. A causa mortis gift is conditional and automatically revocable if the donor survives the anticipated peril. Researchers encountering either phrase in historical sources should immediately locate the other — the two concepts are defined against each other and rarely appear in isolation in substantive legal analysis.
Causa mortis should also be distinguished from testamentary transfers. A will takes effect at death and requires statutory formalities (witnesses, writing, execution). A gift causa mortis takes effect conditionally before death and, at common law, required only delivery and donative intent — no writing, no witnesses, no probate. This distinction made causa mortis gifts both useful and suspect: they could be used to circumvent the Statute of Wills, a tension courts have managed with varying degrees of strictness across different periods and jurisdictions.
Core Elements
The doctrine of donatio causa mortis requires three conditions, each of which must be satisfied for the transfer to be recognized:
1. Anticipation of imminent death. The donor must be under apprehension of death from a specific, present peril — illness, surgery, perceived danger. A general awareness of mortality is insufficient. The peril must be identified and the donor's belief in its imminence genuine.
2. Delivery. The subject matter of the gift must be delivered to the donee (or to a third party on the donee's behalf) during the donor's lifetime. Constructive or symbolic delivery has been accepted in many jurisdictions for property not susceptible to manual transfer, but the delivery requirement is strictly applied and is the most common point of litigation.
3. Donative intent. The donor must intend to make a present, conditional transfer — not a future promise, not a testamentary disposition. The intent must be to pass the property immediately, subject only to the condition of the donor's death from the anticipated cause.
Revocation is automatic upon the donor's recovery or the donee's prior death. The donor may also revoke expressly during the period of peril.
Why It Matters in Research
The phrase causa mortis is a navigational signal, not a freestanding index term. Researchers searching for gift-law materials in historical sources should search under donatio mortis causa or donatio causa mortis — both word orders appear, and indexes are inconsistent. Rapalje & Lawrence cross-references directly to the donatio entry; Black's does the same. Searching causa mortis alone may yield only the definitional stub, not the substantive doctrine.
The historical tension between causa mortis gifts and testamentary formalities is a recurring theme in nineteenth-century equity reports and treatise literature. Courts sometimes used the delivery requirement as the mechanism to police that boundary — demanding strict delivery where delivery might otherwise have been relaxed — rather than confronting the Statute of Wills issue directly. Researchers reading those cases should track whether the court is actually deciding a delivery question or using delivery as a proxy for a wills-circumvention concern.
Modern treatment varies. Some jurisdictions have codified rules governing causa mortis gifts in their probate or property codes, altering or supplementing the common-law conditions. Others continue to apply the common-law doctrine through case development. Researchers moving from historical to modern materials should verify whether the jurisdiction has legislated in this space.
The causa mortis doctrine also intersects with estate planning and creditor-claim analysis. Because a causa mortis gift, once perfected by the donor's death, passes outside probate, historical sources address whether such gifts are reachable by creditors of the estate. That question is handled differently across jurisdictions and periods.
Historical Dictionary Support
Black's and Rapalje & Lawrence are in complete agreement on the core meaning: causa mortis means "in contemplation of" or "in prospect of" death and operates primarily as a qualifier for the donatio doctrine. Neither source treats causa mortis as an independent concept, and both redirect researchers immediately to the donatio entry — an instructive structural choice reflecting the phrase's dependent function in legal analysis.
What the historical dictionaries do not supply is any account of the doctrinal content of the gift itself, the delivery requirement, the revocability conditions, or the wills-circumvention problem. For those, researchers must move to treatise literature and the equity reports. The dictionary entries are accurate but deliberately minimal: they identify the phrase and point elsewhere.
Jurisdictional Note
The common-law elements of donatio causa mortis are broadly shared across American jurisdictions, but the treatment of constructive delivery, the definition of qualifying peril, and the interaction with state probate codes vary enough to require jurisdiction-specific verification. Some states have modified the doctrine by statute.
Encyclopedia Cross-Reference
Personal Property — Gifts (Inter Vivos, Causa Mortis — Delivery, Intent, Acceptance), The Law Mind Property Law Encyclopedia