JLPT N1 Academia & Logic Vocabulary (2026)
Complete JLPT N1 Academia & Logic vocabulary with readings and example sentences (67 words).
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This category collects 67 words from the register of academic writing and logical argumentation — the vocabulary that dominates N1's critical-essay reading passages and the kind of formal argument-building or refuting found in research writing. Unlike everyday N1 vocabulary, most of these words cluster around a small number of recurring kanji (論, 証, 性, 的), so learning them as a group pays off faster than learning them one at a time.
This article is part of our JLPT N1 Complete Vocabulary Guide. Practice all 67 words with the Academia & Logic Vocabulary deck in Onigiri Anki.
Formal Logic & Inference (12)
Covers the core apparatus of formal reasoning — induction and deduction in their noun, method (法), and adjectival (的) forms, plus axioms and the necessary/sufficient condition distinction — vocabulary that appears whenever an N1 reading passage lays out or critiques a chain of reasoning.
彼は事実を並べて帰納的に結論を導いた。 — He drew a conclusion inductively by lining up the facts.
彼の演繹は筋が通っていた。 — His deduction was logically sound.
授業で演繹法を学んだ。 — In class, we learned the deductive method.
彼女は帰納法で仮説を立てた。 — She used the inductive method to form a hypothesis.
この定理は一つの公理に基づいている。 — This theorem is based on one axiom.
彼が今日来る蓋然性は高い。 — There is a high probability that he will come today.
この本を理解するには、漢字が読めることが必要条件だ。 — An ability to read kanji is a necessary condition for understanding this book.
毎日勉強することは、日本語が上達するための十分条件とは言えないが、大きな助けになる。 — Studying every day cannot be called a sufficient condition for improving your Japanese, but it is a great help.
研究者は、いくつかの例から帰納的に結論を出した。 — The researcher drew an inductive conclusion from several examples.
弁護士は事実から演繹的に結論を導いた。 — The lawyer deduced a conclusion from the facts.
彼は大学で論理学を学んだ。 — He studied logic in college.
その報告書は議論の論理形式を丁寧に説明している。 — The report carefully explains the logical form of the argument.
Proof, Evidence & Refutation (11)
Groups the vocabulary of building or attacking a claim — proving (立証, 論証), disproving (反証, 反駁), and the varieties of supporting evidence (傍証, 裏づけ, 実証的) — which N1 passages use to signal whether an argument holds up.
その主張を覆すには、反証が必要だ。 — To overturn that claim, counterevidence is necessary.
その報告書は彼の関与を立証する証拠となった。 — The report became evidence that substantiated his involvement.
彼は自分の見解を支える論証を示した。 — He presented an argument that supported his view.
仮説検証を重ねて、結果を確かめた。 — We repeatedly tested the hypothesis and verified the results.
証明責任は主張した側にある。 — The burden of proof is on the claimant.
検証可能な仮説のほうが説得力がある。 — A verifiable hypothesis is more persuasive.
彼の主張は強い反駁を受けた。 — His claim was met with a strong refutation.
私たちはその報告書を精査します。 — We will carefully examine the report.
そのデータは彼の理論の裏づけとなった。 — That data became backing for his theory.
その証言は傍証となった。 — The testimony became circumstantial evidence.
その研究は実証的な方法に基づいて行われた。 — The research was conducted based on empirical methods.
Research Method & Scholarly Apparatus (13)
Covers the mechanics of academic research itself: peer review, reproducibility, sampling and variables, and the citation practices (引用, 出典, 参照, 先行研究) that N1 passages assume readers already recognize.
その論文は査読で大きな問題がなかった。 — The paper had no major problems in peer review.
この実験は再現性を高める必要がある。 — This experiment needs to be made more reproducible.
このシステムは信頼性が高い。 — This system is highly reliable.
この変数を変えると、結果も変わる。 — If we change this variable, the result will also change.
政府は病気の広がりを統制しようとしている。 — The government is trying to control the spread of the disease.
私たちは分析のためにデータから標本を選んだ。 — We selected a sample from the data for analysis.
その商品の命名は、宣伝部が決めた。 — The product's naming was decided by the advertising department.
報告書を送る前に、数字を照合してください。 — Please cross-check the numbers before sending the report.
詳しくは十二ページを参照してください。 — Please refer to page 12 for details.
彼はスピーチで有名な作家を引用した。 — He quoted a famous writer in his speech.
そのデータを使う前に、出典を確認した。 — I checked the source of the data before using it.
この研究は先行研究を土台にしています。 — This study is based on previous research.
始める前に研究史を調べました。 — I looked into the history of the field before starting.
Conceptual Operations & Abstraction (10)
Covers the verbs and qualities of intellectual processing — turning particulars into systems, types, and concepts (体系化, 類型化, 概念化) and moving between abstract and concrete (抽象化, 具象化) — the operations a writer performs when building a theoretical framework (理論的枠組み).
研究方法論について議論する必要があります。 — We need to discuss the research methodology.
彼は客観性を意識して報告書を書いた。 — He tried to write the report with objectivity.
彼女の意見には主観性が強い。 — Her opinion is highly subjective.
先生はノートを体系化して見直しやすくした。 — The teacher systematized the notes for easier review.
研究者は結果を三つの型に類型化した。 — The researcher typologized the results into three groups.
その説明で問題を概念化できた。 — I was able to conceptualize the problem through that explanation.
細部から本質を抽象化する必要がある。 — It is necessary to abstract the essence from the details.
その考えは議論を通じて具象化された。 — That idea was concretized through discussion.
因果関係を慎重に調べる必要がある。 — We need to examine the causal relation carefully.
データを論じるには、理論的枠組みが必要だ。 — A theoretical framework is necessary for discussing the data.
Scholarly Debate & Discourse (10)
Covers the vocabulary of contested claims — the orthodox view versus the alternative (通説 vs 異説), plus the words for arguing, disputing, and calling out bad-faith reasoning (詭弁) — essential for N1 passages that stage a debate between positions.
その問題では通説が今も強いです。 — The orthodox view on the issue still prevails.
その点については異説を唱える学者もいます。 — Some scholars propose an alternative view on that point.
その説明は定説として広く受け入れられている。 — That explanation is widely accepted as an established theory.
彼の主張に反論できなかった。 — I couldn't counter his claim.
その計画をめぐる論争はまだ続いている。 — The controversy over the plan is still continuing.
私たちは環境問題について討論した。 — We debated the environmental issue.
私たちはその提案について議論した。 — We discussed the proposal.
その言い訳は詭弁にすぎない。 — That excuse is nothing but sophistry.
彼の言説は説得力がある。 — His discourse is persuasive.
彼女は会議でその問題を提起した。 — She raised the issue at the meeting.
Rigor, Clarity & Coherence (11)
Groups the adjectives and set phrases used to praise or criticize how an argument is constructed — lucid (明晰), rigorous (厳密), internally consistent (首尾一貫, 整合的) — the evaluative vocabulary N1 passages use to judge other people's reasoning.
書類は机の上に整然と並んでいた。 — The files were arranged neatly on the desk.
彼女の説明は明晰でわかりやすかった。 — Her explanation was lucid and easy to understand.
その仕組みは精緻に設計されている。 — The mechanism is elaborately designed.
彼は旅行前に周到な計画を立てた。 — He made a thorough plan before traveling.
その規則は厳密に解釈しなければならない。 — The rules must be interpreted rigorously.
彼の論理展開は追いやすかった。 — His logical development was easy to follow.
彼の説明には論理的一貫性がなかった。 — His explanation lacked logical consistency.
彼女の答えは首尾一貫していた。 — Her answers were consistent throughout.
彼女は論旨展開を整理して、より分かりやすくした。 — She organized the development of her argument and made it easier to follow.
彼の説明は事実と整合的だ。 — His explanation is consistent with the facts.
精密な測定が必要だ。 — We need precise measurements.
The 証 Cluster: Six Ways to Prove Something
This list contains an unusually dense cluster of near-synonyms built on 証 ("evidence, proof"): 立証 (establishing proof, often in a formal or argumentative sense), 論証 (proving through a chain of logical reasoning), 実証的 (demonstrating empirically, through data or experiment), 検証可能 (able to be tested or verified), 反証 (evidence that disproves a claim), and 傍証 (indirect, corroborating evidence that supports without clinching a case). N1 reading passages frequently swap between these terms within a single paragraph, and mixing up 立証 with 論証 or 実証 is a common source of lost points on the exam. 証明責任 ("burden of proof") names the obligation to supply whichever of these forms of proof the argument actually requires.
Frequently Asked Questions
What's the difference between 帰納 and 演繹, and why do both appear in so many forms?
帰納 (induction) reasons from specific observations toward a general rule, while 演繹 (deduction) reasons from a general rule toward a specific conclusion — the two basic directions of logical argument. Both appear as plain nouns (帰納, 演繹), as named methods (帰納法, 演繹法), and as na-adjectives (帰納的, 演繹的), so learning the root pair once lets you recognize all three forms on sight.
Why do so many words in this list end in 性, and what does that suffix mean?
性 converts a quality into an abstract noun, roughly like English "-ity": 再現性 (reproducibility), 信頼性 (reliability), 客観性 (objectivity), 主観性 (subjectivity), and 蓋然性 (probability) are all built this way. Recognizing the pattern lets you infer the meaning of an unfamiliar 〜性 word from its root even before checking a dictionary.
Practice All 67 Academia & Logic Vocabulary Words
Import the Academia & Logic Vocabulary deck into Onigiri Anki and master this category with spaced repetition.