Definition
In constitutional and criminal law, "adhering" is the operative term in the Treason Clause of the U.S. Constitution, which defines treason as "levying War against [the United States], or in adhering to their Enemies, giving them Aid and Comfort." To adhere means to join with, league oneself to, or cleave to an enemy of the United States — connoting an intentional attachment of loyalty or allegiance to a hostile foreign power or its agents. The word does not stand alone; in the constitutional text it is coupled with "giving them Aid and Comfort," which functions as the required overt act demonstrating that the adherence is more than merely sympathetic in sentiment.
Common Language
Modern common usage (Wiktionary): Present participle of "adhere" — to stick to a surface, or to follow closely a rule, belief, or plan.
Historical common usage (Webster's 1913): To stick fast; to cleave; to be attached firmly; also, to hold, be devoted, or be consistent, as in adhering to a party or opinion.
The common meaning of "adhering" suggests passive attachment or faithful compliance — following a diet, sticking to a plan. The constitutional legal meaning is considerably more charged: it describes an active alignment of loyalty with an enemy of the state, implying conscious choice and political betrayal. The gap matters because courts have consistently required proof of intentional, voluntary attachment — not mere sympathy or association.
Common Confusion
"Adhering to enemies" is frequently conflated with the separate treason prong of "levying war." They are distinct constitutional categories. A person who participates in armed domestic rebellion is levying war; whether they are simultaneously "adhering to enemies" depends on whether those enemies qualify as enemies in the constitutional sense — which, critically, requires a foreign enemy. Rebels and domestic insurgents, being citizens at war with their own government, do not satisfy the "enemies" element for this prong. A treason conviction arising from support for an internal rebellion therefore cannot rest on the adhering clause; it must be grounded in the levying-war prong.
Why It Matters in Research
The primary research significance of "adhering" is its constitutional specificity. Researchers working in treason law must recognize that the term is load-bearing in a two-part test: adhering (the attachment) plus giving aid and comfort (the overt act). Historical sources from the Civil War period are especially important here because courts during that era grappled with whether Confederate supporters could be prosecuted under the adhering clause. The answer — that rebels are not "enemies" within the constitutional definition — was resolved in federal circuit court decisions of that period and shapes how the clause has been read ever since.
Researchers consulting 19th-century digests and case reporters should be alert to the distinction between treason prosecutions grounded on each prong. The adhering clause is narrow and requires a foreign-enemy nexus; conflating it with the levying-war clause in older sources produces misleading results. Anderson's entry simply redirects to TREASON, which is functionally accurate but unhelpful — researchers must trace the full constitutional doctrine rather than relying on dictionary cross-references alone.
The term also appears, with less legal weight, in older equity and contract materials in the sense of a party "adhering" to an agreement or order of court. That usage is largely archaic and should not be imported into constitutional analysis.
Historical Dictionary Support
Black's (both editions) define "adhering" consistently as "joining, leagued with, cleaving to," and both versions invoke the same doctrinal point: that rebels promoting internal rebellion are not "enemies" within the Treason Clause, so a conviction under the adhering branch cannot be sustained in that context. The first edition cites United States v. Greathouse (referenced in Abbott's United States Reports); the second edition cites the same case in fuller form. The two editions are substantively identical on this entry, reflecting that the legal understanding had stabilized by the time of the second edition.
Anderson's adds nothing substantive, offering only a cross-reference to TREASON. This is a case where historical dictionaries agree completely but leave important analytical work undone — they identify the outer boundary of the term (rebels are not enemies) without explaining the positive content of what "adhering" does require when applied to genuine foreign-enemy situations. Researchers should not treat the historical entries as complete statements of the doctrine.
Jurisdictional Note
Treason is a federal constitutional offense defined in Article III, Section 3. The adhering clause is federal law by definition. Some states have their own treason statutes with analogous language, but constitutional analysis of "adhering to enemies" is exclusively a federal matter.
Encyclopedia Cross-Reference
See: Treason; Aid and Comfort; Levying War