Definition
In civil law, a child under the age of seven years. The term derives from the Latin concept of one who lacks the faculty of speech — rendered in the sources as quasi impos fandi, meaning roughly "as if unable to speak." The infans occupied the lowest rung of legal capacity in Roman law: below the age of seven, a child was considered wholly incapable of legal understanding or intention, and no legal act could be attributed to them.
The term is distinct from the broader category of minor or pupil (pupillus), which extended further into childhood and adolescence. The infans was not merely disadvantaged in legal proceedings — the child was treated as categorically outside the domain of legal agency, analogous in legal effect to a person of unsound mind.
Common Language
Wiktionary (modern): "Infant" in ordinary English refers to a very young child, typically one not yet able to walk or talk, often understood as the first year or two of life.
Webster's 1913: "Infant" — a child in the first period of life, beginning at birth; sometimes extended to include any child before the age of reason or puberty.
The gap here is historical and technical rather than colloquial. In modern common usage, "infant" suggests a very young baby. In modern legal usage, "infant" expanded dramatically to mean any person under the age of majority (typically 18 or 21 depending on jurisdiction). The Latin infans is narrower than both: it marks a precise civil-law threshold of seven years, below which no legal capacity whatsoever could be attributed. A researcher encountering infans in a historical legal source should not import the modern legal meaning of "infant" backward onto this term.
Common Confusion
INFANS vs. INFANT (legal): In Anglo-American common law, "infant" became a general term for any person under the age of majority. Infans, by contrast, is a civil-law term of art with a hard age limit of seven years. The two terms share a root but operate in different legal frameworks and describe different populations. A common-law infant might be seventeen; a civil-law infans was, by definition, under seven.
INFANS vs. MINOR vs. PUPILLUS: Roman law distinguished carefully among stages of childhood. The infans (under seven) had no legal capacity. The impubes (roughly seven to puberty) had limited capacity and required a tutor. The minor (puberty to approximately twenty-five) had capacity but received certain protections. Conflating these categories when reading civil-law sources produces significant interpretive error.
Why It Matters in Research
Researchers working in civil law, Roman law, ecclesiastical law, or early American and colonial legal sources will encounter infans in contexts where its precise meaning governs the analysis. The term appears in discussions of contractual incapacity, criminal responsibility, testamentary capacity, and guardianship — but always with the specific seven-year threshold operative.
The maxim Infans non multum a furioso distat — an infant does not differ much from a lunatic — appears in Bracton, in the Digest, and is quoted in Story's Equity Jurisprudence. This maxim was influential in shaping early common-law treatment of children's legal capacity and the analogous treatment of persons of unsound mind. Researchers tracing the doctrinal roots of incapacity doctrine, mental incompetence, or guardianship will find infans a conceptual ancestor worth following.
The term also appears in tax and inheritance provisions of the Codex Theodosianus (the source cited across all four dictionary entries), where age classifications carried significant consequences for succession and guardianship obligations. Researchers in legal history working with late Roman or early medieval sources should treat the seven-year threshold as a formal legal category, not a rough approximation.
One navigational trap: later common-law treatise writers sometimes used infans loosely to describe any young child, importing the civil-law term into a common-law discussion without maintaining the seven-year precision. Context and the legal tradition of the source must guide interpretation.
Historical Dictionary Support
All four sources — Black's (both editions), Burrill, and Bouvier — are in close agreement. Each defines infans as a child under seven years and references the Codex Theodosianus 8.18.8 as authority. The etymology quasi impos fandi appears in all four, confirming it was treated as the standard explanatory gloss.
Black's 2nd edition and Bouvier both include the maxim Infans non multum a furioso distat, tracing it through Bracton and the Digest. This maxim is genuinely instructive: it reveals the theoretical basis for the civil-law treatment of the infans — not as a lesser legal actor, but as one assimilated to legal non-existence alongside the furiosus (madman). Story's Equity Jurisprudence sections 223, 224, and 242, cited in Black's 2nd, show this civil-law concept actively influencing equity doctrine in American courts.
What the historical dictionaries do not address is the doctrinal trajectory: how the concept of the infans fed into common-law age-of-discretion reasoning, and how the seven-year threshold persisted in certain criminal law contexts (age of criminal responsibility) long after the Latin terminology dropped out of use. Researchers should look beyond the dictionary entries to the treatise literature — particularly Bracton and the institutional writers — for the fuller story.
Jurisdictional Note
Infans as a technical term is a civil-law concept and does not appear as operative terminology in modern common-law jurisdictions. However, its functional legacy persists: many common-law systems historically treated seven years as a threshold of legal significance in criminal responsibility and evidentiary competency. Researchers in Louisiana, Quebec, and other mixed or civil-law jurisdictions may encounter the term or its conceptual framework more directly in older statutory and case materials.