Definition
Liberty of speech is the constitutionally recognized right to express opinions and state facts orally, free from prior government censorship or restriction. It is the spoken counterpart to liberty of the press, and together the two form the broader guarantee of expressive freedom secured by the First Amendment to the federal Constitution and by analogous provisions in state constitutions.
Because modern constitutional doctrine has largely merged oral and written expression under the single umbrella of "freedom of speech," liberty of speech as a discrete term appears primarily in older legal sources. Contemporary doctrine treats the two as functionally identical for most purposes, though the distinction occasionally resurfaces in specialized contexts such as legislative privilege or professional licensing.
Bouvier's identifies three recognized applications of the term:
(1) Legislative speech — the freedom of legislators to speak in public assemblies, discuss public matters, draft committee reports, and otherwise discharge the functions of office. This is an official privilege, not a general public right, and corresponds to the Speech or Debate Clause protection embedded in Art. I, § 6 of the federal Constitution.
(2) Professional speech — the freedom of counsel and other officers of the court to speak in the performance of their legal duties, subject to the bounds of relevance and good faith. Courts have historically given attorneys considerable latitude in argument without defamation liability.
(3) General public speech — the freedom belonging to all persons to express views on matters of public concern, limited by the law's remedies for defamation, breach of the peace, and incitement. This is the form of the right most directly at stake in modern First Amendment litigation.
Common Language
Modern common usage (Wiktionary): A synonym for freedom of speech.
Historical common usage (Webster's 1913): Webster's does not give the compound phrase a dedicated entry; "liberty" and "speech" are each defined in their ordinary senses, and the combination would have been understood simply as the freedom to speak one's mind.
Editorial note: The gap between common and legal usage is real but narrowing. In ordinary language the phrase is interchangeable with "freedom of speech." In legal usage, and especially in historical sources, "liberty of speech" carries a more technical structure: it is subdivided by speaker category (legislators, counsel, general public), and each category carries different scope, different limitations, and different remedies. A researcher treating the phrase as a simple synonym for its modern constitutional counterpart risks missing those distinctions.
Common Confusion
Liberty of speech is frequently collapsed into freedom of speech in both popular writing and modern judicial opinions. The terms are not wrong to use interchangeably in casual constitutional discussion, but the older distinction matters in two research contexts. First, legislative speech privilege (the first Bouvier category) is governed by different doctrine than public speech rights — it is absolute within its scope and does not depend on a balancing of governmental interests. Second, professional speech by counsel was traditionally treated as a qualified privilege in defamation law, not a constitutional right. Applying modern First Amendment analysis backward onto historical sources that use "liberty of speech" in one of these narrower senses will produce anachronistic readings.
Recognized Forms
/SUBTYPES
1. Legislative speech — absolute official privilege for legislators speaking in their official capacity.
2. Forensic or professional speech — qualified protection for counsel, witnesses, and court officers speaking in the course of legal proceedings.
3. General public liberty of speech — the broad popular right subject to reasonable regulation, now analyzed under First Amendment doctrine.
Why It Matters in Research
Researchers working in the Law Mind corpus need to watch for three navigational traps with this term.
First, temporal drift. Sources from the eighteenth and nineteenth centuries use "liberty of speech" with a precision that modern doctrine has largely abandoned. Bouvier and Rapalje treat it as a structured term with enumerated subcategories. Post-New Deal constitutional scholarship and modern case law have replaced the taxonomy with a unified "freedom of speech" framework. Do not assume that an older source using the term means what a modern court would mean.
Second, the prior restraint focus. Both Black's and Rapalje define the liberty primarily by what it prohibits — governmental censorship or restriction beforehand. This prior-restraint framing was the dominant concern of early free-speech theory. Modern doctrine also addresses post-speech punishment, compelled speech, and content-based discrimination, none of which map cleanly onto the older definition. Historical sources will appear underinclusive if read against a modern doctrinal baseline.
Third, the federal/state split. Bouvier explicitly notes that both federal and state constitutions protect this liberty. Before incorporation of the First Amendment against the states through the Fourteenth Amendment (a twentieth-century development), state constitutional provisions were the primary operative source for most liberty-of-speech claims. Historical cases relying on state constitution language may use "liberty of speech" to mean something slightly different than what the federal First Amendment would later protect. Check which constitution is operative before drawing doctrinal conclusions.
For researchers using the Employment & Labor encyclopedia entries, the "liberty" interest language in procedural due process doctrine (Roth-type liberty interests in government employment) uses the word "liberty" in a distinct constitutional sense — it does not refer to liberty of speech as an expressive right, though the two can overlap when a government employee's speech triggers an adverse employment action.
Historical Dictionary Support
The three shelf sources converge on the core definition — freedom to speak without prior governmental censorship — but diverge in structure and emphasis.
Black's offers the broadest, most constitutional framing: liberty of speech is the freedom accorded by constitution or laws to express opinions and facts orally, uncontrolled by censorship. The definition is simple and does not subdivide the right by speaker category.
Rapalje & Lawrence closely tracks Black's but adds a comparative gesture — "like the liberty of the press" — that is analytically significant. It signals that the two liberties were understood as parallel, complementary, and governed by similar principles, not as aspects of a single merged right. This pairing is historically important for understanding why early treatise writers and courts sometimes analyzed spoken and printed expression under separate doctrinal heads.
Bouvier is the most detailed and the most useful for structural research. His subdivision into legislative, professional, and general public liberty reflects the actual doctrinal terrain of nineteenth-century practice. What all three sources omit is the modern First Amendment superstructure — the tiers of scrutiny, the content/viewpoint distinction, the public forum doctrine, and the treatment of symbolic and commercial speech. None of those concepts appear in the historical entries because they postdate the sources by decades or more.
Jurisdictional Note
Every U.S. state constitution contains some protection for freedom of speech or liberty of speech, but the scope varies. Some state provisions are broader than the federal First Amendment and protect speech in nominally private spaces (such as shopping malls open to the public). Researchers using pre-twentieth-century sources should verify which constitution's version of liberty of speech the source is interpreting, as federal incorporation of the First Amendment against the states was not established until well into the twentieth century.
Encyclopedia Cross-Reference
The Law Mind Constitutional Law Encyclopedia: Procedural Due Process in Government Employment — Property and Liberty Interests (for liberty interests intersecting with employee speech)
The Law Mind Employment & Labor Law Encyclopedia: Social Media and Employee Speech (for modern applications of speech protection in employment contexts)