Definition
As an adjective in legal contexts, secret means concealed, hidden, or withheld from the knowledge of persons who would ordinarily have an interest in or be affected by the thing concealed. The term does not carry an independent legal definition as a standalone noun or adjective; its legal significance depends almost entirely on the compound or modified term it appears in.
The principal legal contexts in which secret operates:
1. Trade secret. Information — including formulas, processes, methods, compilations, or business data — that derives independent economic value from not being generally known or readily ascertainable, and that is subject to reasonable efforts to maintain its secrecy. This is the dominant modern legal usage and the context in which the term generates the most substantial body of law.
2. Secret lien. A lien that is not disclosed or recorded as required, rendering it concealed from third-party creditors or purchasers who have no notice of its existence.
3. Secret trust. A testamentary arrangement in which a testator leaves property to a named person with a private, undisclosed understanding that the recipient will hold or apply the property for the benefit of another. The trust obligation exists outside the face of the will.
4. Secret partner. A partner whose involvement in a partnership is deliberately concealed from the public and from those dealing with the firm.
5. Secret committee. A legislative or deliberative body meeting outside public view, historically associated with proceedings from which ordinary observers are excluded.
Common Language
Modern common usage (Wiktionary): To make or keep secret; to hide secretly.
Historical common usage (Webster's 1913): Hidden; concealed; as, secret treasure; secret plans; a secret vow. Also: withdrawn from general intercourse or notice; faithful to a secret; not inclined to divulge.
The common meaning of secret — simply hidden or withheld — tracks closely enough with the legal usage that no dramatic gap exists. The research challenge is different: in legal sources, secret rarely stands alone. Researchers who search for secret as a freestanding legal concept will retrieve little of practical value. The operative legal weight almost always sits in the compound term (secret lien, secret trust, secret partner), and those compounds must be searched separately. The additional Wiktionary verb sense — to secrete, meaning to hide something away — maps onto the legal concept of secreting assets or evidence, which appears in fraud and contempt contexts under the related term SECRETE.
Common Confusion
Secret and confidential are sometimes used interchangeably in contracts and employment law, but they carry different implications. Confidential information is information disclosed in a relationship of trust, with an expectation of restricted use — but it may be widely known within an organization or even to multiple parties. Secret information implies a narrower circle of disclosure and is the threshold concept for trade secret protection, which requires that the information not be generally known or readily ascertainable. A document marked "confidential" is not automatically a trade secret. The distinction matters acutely in litigation over misappropriation claims.
Secret and privilege are also occasionally conflated. Attorney-client privilege protects communications, not simply information that is secret. Something can be secret without being privileged, and something privileged may not be secret from all parties.
Recognized Forms
/SUBTYPES
The following compounds are established legal terms of art, each with independent doctrinal content:
— Secret trust (further divided in equity between fully secret trusts and half-secret trusts, depending on whether the will acknowledges the trust obligation at all)
— Secret lien
— Secret partner / secret partnership
— Trade secret (the most litigated and legislatively developed form)
— Secret equity (an equitable interest not apparent from the legal record)
Why It Matters in Research
The primary research trap with secret is treating it as a searchable standalone concept rather than as a modifier. Historical legal dictionaries, including Black's (2nd Ed.) and Anderson's, handle the term almost entirely by cross-reference — directing researchers to the compound entries (lien, trust, partner, equity) rather than building out a definition of secret itself. This means corpus searches on secret alone will systematically miss the doctrinal content that researchers actually need.
In trade secret law specifically, the research landscape bifurcated significantly after 2016. Before the Defend Trade Secrets Act (DTSA), trade secret law was almost entirely a matter of state law, with most states following some version of the Uniform Trade Secrets Act (UTSA). Post-DTSA, there is a federal civil cause of action for trade secret misappropriation, creating a dual federal-state track. Sources predating 2016 will not reflect this overlay. The definition of what qualifies as secret — and specifically the reasonable-measures-to-maintain-secrecy requirement — is an area of active and evolving case law that older secondary sources handle incompletely.
For secret trust and secret lien research, be aware that the case law is heavily English in origin and that American jurisdictions have varied considerably in reception. English equity decisions on half-secret trusts, for instance, have not been uniformly adopted by American courts. Historical sources will draw primarily on English authority without flagging American divergence.
The verb form secrete — to hide or conceal assets — appears in fraud, bankruptcy, and criminal contexts and should be tracked as a separate search term. Anderson's cross-reference to SECRETE is the most useful pointer in the historical sources for this usage.
Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) defines secret functionally: concealed, hidden, not made public, kept from the knowledge of persons liable to be affected. Black's then dispatches the reader to the compound entries — committee, equity, lien, partnership, trust — where the operative legal substance lives. This structure is itself informative: it confirms that secret has no independent legal doctrine but is instead a structural modifier that changes the legal character of whatever noun follows it.
Anderson's Dictionary of Law does the same by cross-reference, pointing to CONCEAL, DISPOSE, EQUITY, LIEN, PARTNER, POSSESSION (Adverse), and SECRETE. The cross-reference to POSSESSION (Adverse) is worth noting — secrecy or concealment can affect the running of limitations periods and the element of openness in adverse possession claims, a connection that neither Black's nor modern sources develop prominently.
Rapalje & Lawrence does not provide a useful entry for SECRET; the historical source materials appear to contain a misfiled entry for SEAWORTHY rather than SECRET. Researchers should not rely on Rapalje & Lawrence for this term.
None of the historical dictionaries anticipate trade secret law in its modern statutory form. The UTSA dates to 1979, the DTSA to 2016 — both well outside the coverage period of these sources. Historical dictionary entries are useful for the equity concepts (secret trust, secret lien, secret partner) but should be treated as foundational context only, not current doctrine.
Jurisdictional Note
Trade secret law is the area of most significant jurisdictional variation. The majority of states have adopted the UTSA, but with variations in definition and remedies. A handful of states, including New York, developed independent common law frameworks that diverge from the UTSA model in material respects. The DTSA operates as a federal overlay and does not preempt state law, meaning a single dispute may involve simultaneous federal DTSA and state UTSA (or common law) claims with somewhat different standards.
Encyclopedia Cross-Reference
Trade Secret Law — Overview, DTSA, and the Uniform Trade Secrets Act (Law Mind Intellectual Property Encyclopedia)
Trade Secret Subject Matter — What Qualifies as a Trade Secret (Law Mind Intellectual Property Encyclopedia)
Trade Secrets — The Defend Trade Secrets Act and State Law (Law Mind Employment & Labor Law Encyclopedia)