The seriatim meaning is straightforward: it’s a Latin legal term for doing something “one by one, in sequence.” When a process is handled seriatim, each item in a series gets its own separate treatment rather than being lumped together with the rest. Courts use the word when judges write individual opinions, lawyers use it when answering a complaint paragraph by paragraph, parliamentarians use it when debating a long motion section by section, and actuaries use it when calculating reserves one policy at a time. The common thread never changes. Take the items in order. Give each one its own attention.
Seriatim Opinions in Court
Before John Marshall became Chief Justice in 1801, the Supreme Court followed the English appellate tradition of issuing seriatim opinions. Each justice wrote and delivered a separate explanation for the outcome, so readers could trace exactly how every member of the bench reached a vote.1Supreme Court Historical Society. The Practice of Dissent in the Early Court Marshall pushed the Court toward a single “Opinion of the Court” instead. Unified opinions strengthened the institution’s authority and made rulings easier to follow.
Seriatim opinions never fully disappeared. Modern concurrences and dissents are a surviving form of the same practice. When a justice writes separately to flag a different route to the same result, or to warn about an interpretation that could matter in future cases, that opinion stands on its own in the seriatim tradition.1Supreme Court Historical Society. The Practice of Dissent in the Early Court The structural difference is that a single majority opinion is now the default and individual writing is the exception.
Answering a Complaint Paragraph by Paragraph
The seriatim approach shows up most often in civil pleading. A complaint arrives as a numbered list of allegations, and the defendant’s answer is expected to walk through that list and respond to each numbered paragraph individually. Federal Rule of Civil Procedure 8(b) requires a responding party to admit or deny the allegations asserted against it.2Legal Information Institute. Rule 8 – General Rules of Pleading
Why the paragraph-by-paragraph format matters becomes clear the moment you skip one. Under Rule 8(b)(6), any allegation that goes undenied in a responsive pleading is automatically treated as admitted, with the sole exception of allegations about the amount of damages.2Legal Information Institute. Rule 8 – General Rules of Pleading A blanket denial that fails to address specific paragraphs risks letting a court treat overlooked factual claims as conceded. The same principle governs requests for admission under Rule 36: fail to respond within 30 days and the matter is conclusively established.3Legal Information Institute. Rule 36 – Requests for Admission
You do have options short of a full admission or denial. If only part of an allegation is accurate, the rules allow a partial denial that admits the correct portion and denies the rest. If you genuinely lack enough information to confirm or deny a claim, you can say so, and that statement functions as a denial.2Legal Information Institute. Rule 8 – General Rules of Pleading Every paragraph still gets an explicit response. None can float by unaddressed.
Seriatim Consideration Under Robert’s Rules
Parliamentary procedure has a formal seriatim mechanism called “Consideration by Paragraph.” When a proposal is long or contains multiple distinct parts, a member can move to break it into sections and debate each one individually before the assembly votes on the whole thing.4Sheridan College. Roberts Rules of Order Quick Reference The motion requires a second and passes by majority vote.
The presiding officer opens debate on the first section, members discuss and amend it, and the group then moves on to the next. Each section gets its own focused debate. After every section has been considered, the entire document opens back up for further amendment and a final vote on the whole package.4Sheridan College. Roberts Rules of Order Quick Reference The seriatim process structures debate and amendment only. It does not change the vote threshold required for final adoption.
Breaking a proposal apart this way heads off a common problem in organizations: a single up-or-down vote on a lengthy resolution where members support most of the content but have serious objections to one piece of it. Seriatim consideration lets the group fix the problematic section instead of voting the whole thing down.
Reading a Contract in Sequence
Contract interpretation relies on a related discipline. When a dispute reaches a court, the judge reads the agreement from beginning to end and gives meaning to each provision rather than cherry-picking isolated clauses. The underlying principle is that no provision should be treated as meaningless. If the parties included a sentence, the presumption is that it was supposed to do something, and a sequential reading is the best way to figure out what.
This matters most where sections appear to conflict. An indemnification clause in paragraph twelve might seem to contradict a limitation of liability in paragraph twenty. Reading them in order, in the context of the definitions, recitals, and scope provisions that came before, usually reveals how they were meant to interact. Many complex contracts also include an “order of precedence” clause that establishes a hierarchy among the agreement’s documents, so that if the main contract says one thing and an appendix says another, the precedence clause dictates which controls. Where terms address the same subject but are merely more restrictive or more specific rather than contradictory, they tend to be treated as supplemental. A seriatim review still matters even with a precedence clause, because you have to read each provision to determine whether a real conflict exists in the first place.
Seriatim Valuation in Insurance and Pensions
The word also carries a specific technical meaning in actuarial science. A seriatim valuation calculates reserves or liabilities for each individual policy in a portfolio instead of grouping similar policies together and running a single calculation for the batch. The Society of Actuaries defines it simply: one cell equals one policy, with no grouping, categorization, or remapping.5Society of Actuaries. Inforce Data Compression Methods for Actuarial Modeling
The alternative is aggregate modeling, which bundles policies that share characteristics like age, sex, or coverage amount into groups called model points. Aggregate modeling runs faster because there are fewer calculations, but it sacrifices granularity. Seriatim valuation captures every quirk of every individual policy. For decades, computing limitations made aggregate modeling the only practical option for large portfolios. Modern processing power has made seriatim feasible for many applications, though it still demands significantly more computing time and memory.
The Pension Benefit Guaranty Corporation uses seriatim valuation when calculating liabilities for terminated pension plans, provided the plan’s data meets threshold requirements for completeness and accuracy.6Pension Benefit Guaranty Corporation. Actuarial Valuation Report In insurance reserve calculations, early regulatory frameworks required seriatim computation of deterministic reserves on a policy-by-policy basis, though some frameworks have since shifted to allow aggregate methods as well.7American Academy of Actuaries. Elimination of Seriatim Reserve References Actuaries still use seriatim runs as a validation tool, checking individual policy results in a spreadsheet to verify that a larger model is producing accurate outputs.