Definition
Confirmatio crescens (Latin: "increasing confirmation") is a term from old English property law referring to a form of confirmation that enlarges a rightful estate already held by the grantee. Where an ordinary confirmation merely ratifies and secures an existing interest, a confirmatio crescens goes further — it operates to increase the quantum or extent of that estate, effectively passing an additional interest to the holder.
The concept belongs to the classical common law doctrine of confirmation, which governed how a grantor could validate, strengthen, or expand rights already conveyed. Confirmatio crescens represents the enlarging branch of that doctrine, as opposed to confirmatio diminuens, which operates in the opposite direction by reducing or qualifying an estate.
Common Confusion
Confirmatio crescens is most usefully understood in contrast to two related terms:
CONFIRMATIO DIMINUENS is the converse — a confirmation that diminishes or qualifies a rightful estate rather than enlarging it. Rapalje & Lawrence treat the two terms together, making clear they are mirror concepts within the same doctrinal framework.
CONFIRMATION (general) refers to any act ratifying or securing a prior conveyance. Not every confirmation enlarges the estate; many merely cure defects or quiet title. A researcher encountering the unqualified term "confirmation" in a historical deed or pleading should not assume crescens (enlarging) effect without further context.
The maxim confirmatio est nulla ubi donum præcedens est invalidum — "there is no confirmation where the preceding gift is invalid" — applies to both forms and marks a foundational limit: confirmation, whether enlarging or diminishing, cannot operate on a void prior grant. It presupposes a rightful, if imperfect, estate already in existence.
Why It Matters in Research
This is a term of art encountered almost exclusively in historical sources — old English conveyancing treatises, early American property cases, and pleadings rooted in common law real property doctrine. It will not appear in modern statutory or regulatory materials and is effectively obsolete in contemporary practice.
Researchers working in Law Mind sources should note several navigational points:
The primary treatise authority across all four source dictionaries is Sheppard's Touchstone of Common Assurances (cited as "Shep. Touch. 311"), a seventeenth-century English conveyancing manual that was widely relied upon by American courts through the nineteenth century. Coke on Littleton (Co. Litt. 295b) supplies the supporting maxim on confirmation and defects.
Bouvier's entry is a cross-reference only, directing the reader to the general CONFIRMATIO entry rather than treating crescens independently. Researchers using Bouvier as a first stop will need to follow that cross-reference to build a complete picture.
The term is unlikely to appear indexed under modern subject headings. Historical searches in deeds, equity pleadings, and ejectment cases should focus on the Latin phrase or the phrase "enlarging confirmation." The paired concept of confirmatio diminuens frequently appears in the same passage or annotation, so locating one usually surfaces the other.
Because the doctrine requires a pre-existing rightful estate as its foundation, cases disputing whether a prior conveyance was valid or void will bear directly on whether any confirmatio crescens could have operated. Estate validity questions and confirmation questions are therefore linked in historical real property litigation.
Historical Dictionary Support
The four source dictionaries converge closely on this term, with little substantive disagreement.
Black's and Rapalje & Lawrence offer nearly identical short-form definitions — "an enlarging confirmation; one which enlarges a rightful estate" — both citing Shep. Touch. 311 as sole authority. Burrill's provides the most expansive treatment, adding that the confirmation "tends and serves to increase and enlarge a rightful estate, and so to pass an interest," clarifying that the operative effect is the passage of an additional estate interest, not merely the ratification of an existing one. This elaboration is useful: it makes explicit that confirmatio crescens is transactive, not merely declaratory.
Bouvier's cross-reference structure is characteristic of that dictionary's treatment of Latin maxims and subspecies terms — it organizes confirmatio doctrine under a single parent entry rather than generating standalone entries for every variant. Researchers relying on Bouvier alone may underestimate how technically distinct crescens and diminuens were treated in practice.
None of the historical dictionaries situate the term within a broader procedural or litigation context, which reflects the largely treatise-bound, conveyancing-centered world in which the concept lived. Modern dictionaries do not carry the term at all, which is itself informative: the doctrine passed out of practical use as estates in land were simplified and statutory conveyancing replaced common law forms.
Jurisdictional Note
Confirmatio crescens is a common law English doctrine transplanted into early American property law. Its application in American jurisdictions was uneven and largely confined to the period before mid-nineteenth century conveyancing reforms. States that moved early to statutory deed recording systems and simplified fee simple conveyancing had little occasion to develop or refine the doctrine domestically.