Definition
Transmission carries distinct meanings depending on legal context. Two principal legal senses are operative in the Law Mind corpus:
1. Civil law inheritance right. The right by which an heir or legatee who dies before accepting or exercising an inheritance or legacy may nonetheless pass that entitlement to their own successors. The right does not lapse with the heir's death but transmits down the line of succession, provided the heir survived the testator long enough to acquire the right. This is the classical legal meaning preserved in the historical dictionaries.
2. Energy and communications law. The conveyance of electricity, data, signals, or other transmissible resources across a network or infrastructure system. In energy law specifically, transmission refers to the high-voltage transport of electric power across long-distance lines from generators to distribution systems — a use that is central to federal regulatory frameworks governing wholesale electricity markets and grid access. In telecommunications and broadcasting law, transmission denotes the sending of signals, content, or data across a network, wire, or airwave.
---
Common Language
Modern common usage (Wiktionary): The act of transmitting data, signals, or electric power; something transmitted, such as a message or disease; a mechanical gearbox assembly through which engine power is sent to a vehicle's driveshaft.
Historical common usage (Webster's 1913): The act of transmitting letters, writings, papers, news, and the like from one country to another; the transmission of rights, titles, or privileges from one generation to another; the right possessed by an heir or legatee of transmitting any inheritance, legacy, right, or privilege to their successors.
The common-language senses cover a wide functional range — mechanical, biological, communicative — none of which carries legal weight on its own. The gap matters most in energy law, where "transmission" is a term of art with regulatory consequences: it describes a specific tier of the electric power delivery system (high-voltage bulk transport, as distinguished from local distribution), and that distinction determines which entity has regulatory jurisdiction and under what rate regime. A researcher using the word casually risks collapsing a jurisdictionally significant distinction.
---
Common Confusion
Transmission is frequently conflated with distribution in energy law contexts. Transmission refers to the bulk transport of electricity at high voltage across long distances; distribution refers to the lower-voltage delivery of power to end-use consumers. The Federal Power Act draws this line explicitly, and the distinction determines whether the Federal Energy Regulatory Commission or state public utility commissions hold primary authority. Misreading "transmission" as a generic synonym for "delivery" in regulatory documents will produce research errors. In inheritance contexts, transmission is sometimes confused with simple succession or devise — but transmission has the specific technical meaning of an heir's right to pass an entitlement the heir never personally exercised, which is narrower than general succession.
---
Recognized Forms
/SUBTYPES
In energy law:
- Open-access transmission: The nondiscriminatory access requirement imposed on transmission owners, requiring them to provide third parties access on the same terms as the owner's own affiliates. Foundational to FERC Order No. 888 (1996).
- Transmission service: The actual provision of power transport capacity under tariff, including firm and non-firm service categories.
- Transmission constraint: A physical or operational limit on the capacity of transmission infrastructure, relevant in both reliability and market pricing contexts.
In civil law inheritance:
- Transmission by heirs (transmissio hereditatis): The right passes to the heir's successors where the heir dies before accepting.
- Transmissio ex capite in integrum restitutionis: A specific Roman law form allowing a minor's heir to exercise rights the minor could have claimed had they lived.
---
Why It Matters in Research
This is a term whose legal weight has migrated almost entirely across history. In pre-twentieth-century legal texts and the historical dictionaries, transmission is an inheritance doctrine — a precise civil law mechanism with defined conditions and limits. In contemporary legal research, the dominant usage is regulatory and infrastructural, appearing constantly in energy law, telecommunications, and data privacy contexts.
Researchers working in pre-twentieth-century sources, particularly those touching civil or Roman law traditions or early American inheritance law, will encounter transmission exclusively in the succession sense. Do not import the energy-law reading backward. Conversely, researchers working in FERC regulatory materials, utility law, or broadband and telecommunications policy will encounter transmission as infrastructure and access terminology — its civil law ancestry is irrelevant there.
Anderson's cross-reference to DESCENT signals that transmission in the succession sense was considered a sub-topic of descent doctrine rather than a freestanding concept. This means historical researchers should cast their net broadly: the doctrine appears under descent, succession, legacy, and right of representation headings in older treatises.
In energy law research specifically, transmission policy is heavily shaped by FERC rulemaking rather than common law or statute alone. The relevant corpus is primarily regulatory orders, tariff filings, and FERC adjudication — not case reporters in the traditional sense. Researchers should approach FERC's open-access transmission rulemakings as the functional "common law" of this field.
For data and communications law, transmission appears in wiretapping, privacy, and broadcasting statutes in ways that require precise attention to statutory definitions — what counts as an "electronic transmission" under a given act may differ from the technical or ordinary meaning.
---
Historical Dictionary Support
Black's Law Dictionary (both the 1st edition and the 2nd edition supplemental) define transmission exclusively in the civil law inheritance sense, citing Domat, Toullier, the Digest, and the Justinian Code. These are reliable citations to real sources. The Digest reference (Dig. 50, 17, 54) reflects the Roman law maxim that rights that accrue to an heir do not automatically extinguish on the heir's death — a principle foundational to the doctrine.
Anderson's Dictionary of Law dispenses with its own definition and redirects entirely to DESCENT, which suggests that by Anderson's era the term was not considered independently significant enough to warrant a standalone treatment — it was subsumed into broader succession doctrine.
Webster's 1913 is notable for including both the general communicative sense and the legal inheritance sense side by side, which confirms that at the turn of the twentieth century the two meanings coexisted without the specialized energy-law usage that would come to dominate in the regulatory era. This makes Webster's 1913 useful for confirming that pre-twentieth-century appearances of "transmission" in legal texts are more likely to carry the inheritance meaning than any infrastructure sense.
None of the historical dictionaries anticipate the energy law usage. This is an expected gap: FERC's transmission access regime postdates these dictionaries by decades. Researchers should not treat the absence of energy-law definitions in these sources as evidence that transmission was undefined — only that the regulatory meaning had not yet crystallized.
---
Jurisdictional Note
The civil law inheritance sense of transmission is primarily relevant in Louisiana (U.S.) and in jurisdictions with civil law or mixed legal traditions; common law jurisdictions absorbed similar results through different doctrinal vocabulary (e.g., "vested legacy" analysis). In energy law, federal jurisdiction over interstate transmission is well established under the Federal Power Act, but the transmission/distribution boundary — and thus the federal/state jurisdictional line — has been a persistent source of regulatory litigation.
---
Encyclopedia Cross-Reference
FERC Ratemaking, Market-Based Rates, and Transmission Policy — Law Mind Environmental & Energy Law Encyclopedia.
---