Definition
Abatement is the reduction, suspension, termination, or defeat of something — a legal proceeding, a tax liability, a nuisance, or a property right — that would otherwise continue or take full effect. Because the term operates across several distinct legal contexts, it carries different technical meanings depending on the field:
1. PLEADING (historical). A defendant's successful plea showing that the plaintiff's writ or declaration was defective in form or substance — that the wrong parties were named, that the plaintiff described the cause of action incorrectly, or that some procedural prerequisite was unmet. A plea in abatement did not defeat the underlying claim permanently; it suspended the action, forcing the plaintiff to correct the defect and recommence properly. It was a dilatory defense, not a final judgment on the merits.
2. NUISANCE. The suppression or removal of a nuisance — whether by court order, by public authority, or in limited circumstances by a private individual acting to protect against immediate harm. Abatement of a nuisance ends the offending condition rather than merely compensating for it.
3. PROBATE AND WILLS. The proportional reduction of bequests or devises when the assets of an estate are insufficient to satisfy all gifts in full. When an estate cannot pay its debts and also honor all testamentary gifts, legacies abate — typically in a set order (residuary, then general, then specific) — until the estate's obligations are met.
4. TAX. The cancellation or reduction of a tax assessment, penalty, or interest charge by a taxing authority. A taxpayer who demonstrates reasonable cause, qualifies under a first-time abatement program, or successfully challenges an erroneous assessment may obtain abatement of amounts otherwise owed.
5. FREEHOLD INTRUSION (archaic). The wrongful entry by a stranger into freehold land after the death of the previous owner and before the heir has taken possession. This usage is now largely obsolete but appears in older property and pleading texts.
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Common Language
Modern common usage (Wiktionary): The act of abating or the state of being abated; a lessening, diminution, or reduction; a moderation; removal or putting an end to.
Historical common usage (Webster's 1913): The act of abating, or the state of being abated; a lessening, diminution, or reduction; removal or putting an end to; as, the abatement of a nuisance is the suppression thereof. Also: the amount abated; a rebate or discount allowed.
The common meaning — simple reduction or lessening — is not wrong as far as it goes, but it collapses five legally distinct mechanisms into one intuitive idea. A researcher relying on the ordinary sense of "abatement" will miss the procedural precision of a plea in abatement (which is about defect and delay, not substantive defeat), the succession rules governing legacy abatement in probate, and the formal administrative process governing tax abatement. The word's familiarity is a trap: it sounds self-explanatory while pointing to very different legal consequences depending on context.
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Common Confusion
ABATEMENT vs. BAR. A plea in abatement and a plea in bar are both defendant's defenses, but they operate differently. A plea in abatement attacks the form or procedural posture of the action — it defeats this lawsuit, not the underlying right. A plea in bar attacks the substance and, if successful, defeats the plaintiff's right entirely. Historical sources, particularly Bouvier, spend considerable space distinguishing the two because confusion between them had real procedural consequences: a defendant who raised matter of bar as matter in abatement, or vice versa, could waive important rights. Modern civil procedure has largely absorbed both into the motion practice under rules like Federal Rule of Civil Procedure 12, but the distinction remains important when reading pre-code cases.
ABATEMENT vs. REDUCTION/DISCOUNT. In tax contexts, practitioners sometimes use "abatement," "reduction," "credit," and "refund" interchangeably. They are not synonymous. An abatement cancels an assessed liability before it is collected. A refund returns money already paid. A credit offsets future liability. Conflating these terms when researching IRS procedures or judicial review standards will produce unreliable results.
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Recognized Forms
/SUBTYPES
Plea in Abatement: The formal procedural vehicle in common-law pleading by which a defendant raised grounds for abating an action. Subject to strict rules: had to be raised early, before pleading to the merits, and had to propose a remedy (i.e., show how the plaintiff could cure the defect).
Abatement of Nuisance: Either judicial (by injunction or order) or, in narrow circumstances, extrajudicial (self-help abatement by an injured party acting without undue force and without breach of the peace).
Abatement of Legacy/Devise: The pro-rata or priority-ordered reduction of testamentary gifts when estate assets are insufficient. Order of abatement (residuary first, then general, then specific/demonstrative) may be modified by the testator's expressed intent.
Tax Penalty Abatement: Administrative reduction of penalties or interest assessed by a taxing authority, available on grounds such as reasonable cause, statutory exception, or first-time abatement programs. Distinct from audit reconsideration or formal appeals.
Abatement of Rent: A reduction in rent, either by agreement or by operation of law, typically where the leased premises become partially unusable. Related to, but not identical with, the defense of constructive eviction.
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Why It Matters in Research
The multi-context nature of abatement is the central research hazard. A search for "abatement" across the Law Mind corpus will return results from pleading treatises, probate opinions, nuisance cases, tax rulings, and landlord-tenant disputes — often with no shared doctrinal logic between them. Filtering by context before searching, or reading headnotes carefully, is essential.
For historical pleading research: The plea in abatement is a creature of common-law forms of action and largely disappeared with the adoption of code pleading and modern civil procedure rules. Cases decided before the mid-nineteenth century in most American jurisdictions, and before the Judicature Acts in England, use the term in this technical procedural sense. Post-code cases rarely use "abatement" to mean a pleading defense; when they do, they are usually referring to pre-code doctrine in historical context or applying it in the few jurisdictions that retained elements of common-law pleading longer than most.
For probate research: The order of abatement is a default rule that wills can modify. When reading older wills or probate decisions, look for express language about priority among gifts; its absence triggers the default abatement rules, which varied somewhat by jurisdiction and period.
For tax research: The Law Mind Tax Encyclopedia entries on this term address modern IRS abatement procedures (first-time penalty abatement, reasonable cause, interest abatement under I.R.C. § 6404) and judicial review standards. These are wholly distinct from the historical pleading and property meanings. Researchers working on tax matters should anchor to those encyclopedia entries rather than to the historical dictionary sources, which predate the modern administrative tax system.
For nuisance research: Abatement as a remedy sits alongside damages and injunction. Courts have not always treated self-help abatement favorably; the conditions under which a private party may abate a nuisance without incurring liability are narrower than the general language of older treatises suggests.
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Historical Dictionary Support
The historical dictionaries agree on the core structure of the term but reflect the priorities of their eras. Black's (both editions) leads with the pleading definition, which was the most technically significant meaning in common-law practice and the one most likely to generate litigation over procedure. Bouvier's is the most expansive, devoting substantial space to the plea in abatement — its grounds (misjoinder, fictitious parties, coverture), its timing requirements, and the consequences of defective pleading. Bouvier's treatment is valuable precisely because it reflects the level of procedural granularity that common-law courts actually applied.
Burrill's entry is notably spare — offering the Latin source (abatamentum) and cross-referencing rather than developing the doctrine — which is consistent with Burrill's general approach of compressed entries. Rapalje & Lawrence's version is dense with case citations, useful for locating primary sources but less helpful for understanding doctrine without a guiding framework.
What the historical dictionaries collectively understate: the probate abatement doctrine and nuisance abatement receive far less systematic treatment than the pleading definition. Tax abatement, as a modern administrative concept, is entirely absent — the corpus on that topic belongs to twentieth and twenty-first century administrative sources, not Victorian legal dictionaries. Researchers should not mistake the silence on these topics in historical dictionaries for legal unimportance; it reflects only the era of compilation.
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Jurisdictional Note
The order of abatement of legacies in probate follows a default hierarchy (residuary, general, specific/demonstrative) that most American jurisdictions codified in their probate statutes, but the details — and the extent to which testators can override the default — vary by state. In tax matters, federal abatement procedures (IRS penalty abatement, interest abatement under the Internal Revenue Code) operate independently of state tax abatement regimes, which have their own standards and procedures.
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Encyclopedia Cross-Reference
Abatement of Penalties Reasonable Cause (The Law Mind Tax Encyclopedia)
First-Time Penalty Abatement (The Law Mind Tax Encyclopedia)
Interest Abatement Judicial Review (The Law Mind Tax Encyclopedia)
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