Definition
As a standalone legal term, happiness has no independent legal definition. Its legal significance is wholly derivative: the word appears in the Declaration of Independence's phrase "pursuit of happiness" and, through that lineage, has been interpreted by courts as a constitutional right with identifiable content.
In constitutional usage, the right to pursue happiness means the right to engage in any lawful business, occupation, or vocation, in any manner not inconsistent with the equal rights of others, in ways that may increase one's prosperity or develop one's faculties so as to yield one's highest enjoyment. The term encompasses both economic liberty and personal self-development, though courts have historically emphasized the former.
Common Language
Modern common usage (Wiktionary): The emotion of being happy; joy; elation. Also: prosperity, thriving, wellbeing; good luck or good fortune; fortuitous elegance in language.
Historical common usage (Webster's 1913): An agreeable feeling or condition of the soul arising from good fortune or propitious happening; the possession of circumstances attended by enjoyment; contentment; joyful satisfaction; felicity; blessedness. Also: good luck; prosperity.
The gap between common and legal meaning here is structural rather than definitional. Common usage treats happiness as a subjective emotional state — an internal condition of a person. Legal usage transforms it into an external liberty right — a protected sphere of conduct and economic activity. The Declaration's phrase does not guarantee the feeling of happiness; it protects the freedom to pursue it through lawful activity. This distinction, obvious to constitutional lawyers, is routinely lost on lay readers of the Declaration and on researchers approaching the term through general dictionaries.
Common Confusion
Happiness (the constitutional concept) is frequently conflated with happiness (the emotional state) in popular readings of the Declaration of Independence. This conflation produces a misunderstanding of what the founding-era phrase was understood to protect. Eighteenth-century natural rights theory, drawing on Locke and Blackstone, framed the pursuit of happiness as a right of self-direction in economic and personal affairs — not a guarantee of subjective wellbeing. Courts operationalizing the phrase in the late nineteenth century consistently resolved it in terms of occupational and economic liberty, not hedonic protection. Researchers should also distinguish the Declaration's phrase from state constitutional formulations, which vary and may carry independent doctrinal weight in their own jurisdictions.
Why It Matters in Research
Researchers encounter this term almost exclusively in one of two contexts: (1) constitutional history and natural rights scholarship, and (2) late nineteenth- and early twentieth-century substantive due process cases, where courts read economic liberty protections into constitutional text partly by reference to the pursuit of happiness as a recognized right.
The key research trap is chronological. The dictionary definitions reproduced here — including those from Black's first and second editions and Bouvier's — are anchored to a specific doctrinal moment, exemplified by Butchers' Union Co. v. Crescent City Co., 111 U.S. 757 (1884). That case, and its reading of happiness as occupational liberty, belongs to the Lochner-era trajectory of substantive due process. Researchers working in post-New Deal constitutional law will find this framing largely abandoned at the federal level, though it resurfaces in some state constitutional jurisprudence.
The Anderson's Dictionary entry is notable for gesturing toward the natural law foundation — the ethics-based claim that every person has a right to pursue happiness as a first principle — without fully elaborating it. This underdeveloped thread points researchers toward treatise literature on natural rights rather than case law alone.
Bouvier's and both editions of Black's are functionally identical in their definitions, all tracing to the same Supreme Court passage. Researchers should not treat these as independent confirmations of a broad consensus; they are restatements of a single authority.
State constitutional provisions that use the phrase "pursuing and obtaining happiness" or similar language — found in a number of state declarations of rights — may be litigated independently of federal doctrine and carry their own interpretive histories.
Historical Dictionary Support
The historical dictionaries surveyed speak with one voice on substance but with limited analytical depth. Black's (both editions) and Bouvier's reproduce what is essentially the same gloss drawn from Butchers' Union Co., defining the pursuit of happiness as occupational and economic liberty bounded by the equal rights of others. The formulation is crisp and internally consistent, but it reflects a particular constitutional moment rather than a timeless definition.
Anderson's is the outlier. Its entry gestures toward the deeper natural law claim — that happiness-pursuit is the foundation of ethics and natural law — but the entry as preserved is fragmentary, referencing cases and Blackstone's Commentaries without completing the analytical arc. This makes Anderson's less useful for quick reference but more suggestive of the theoretical underpinnings that Black's and Bouvier's treat as settled and therefore unworthy of exposition.
What all four sources miss: the tension between happiness as an individual economic right and happiness as a broader conception of human flourishing. Founding-era usage drew on multiple traditions — Lockean property rights, Aristotelian eudaimonia, Scottish Enlightenment moral philosophy — that the late nineteenth-century case law collapsed into a single, economically focused reading. Historical dictionary entries written after that judicial consolidation reflect the narrowed meaning without flagging the loss.
Blackstone's Commentaries (1 Bl. Comm. 41), cited in the Black's entries, is the bridge source connecting eighteenth-century natural rights theory to American constitutional interpretation. Researchers tracing the intellectual genealogy of the term should begin there before moving to the Supreme Court cases.
Jurisdictional Note
At the federal level, the pursuit of happiness as an affirmative constitutional right has no independent doctrinal home — the Declaration of Independence is not operative law. State constitutions in several jurisdictions (including Pennsylvania, Virginia, and others) include happiness-related provisions in their declarations of rights, and these have generated independent state-law jurisprudence that does not track federal substantive due process doctrine.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Pursuit of Happiness (primary); Substantive Due Process (for the Lochner-era context); Natural Rights (for the philosophical genealogy); Lochner Era (for the doctrinal trajectory).