| interrogation | 尋問 |
| intimidation | 脅し |
| intonation | 音調 |
| investigation | 調査 |
| invitation | 招待 |
| isolation | 孤立 |
| legislation | 立法 |
| liberation | 解放 |
| limitation | 限定 |
| location | 位置 |
| manifestation | 明示 |
| manipulation | 取り扱い |
| mediation | 調停 |
| medication | 薬 |
| meditation | 瞑想 |
| migration | 移住 |
| minimization | 最小化 |
| miscalculation | 計算違い |
| misinformation | 誤報 |
| moderation | 節度 |
| motivation | やる気 |
| multiplication | 増加 |
| narration | 語り |
| nation | 国家 |
| navigation | 航海 |
| negation | 否定 |
| negotiation | 交渉 |
| nomination | 指名 |
| obligation | 義務 |
| observation | 観察 |
| occupation | 占有、職業 |
| operation | 操作 |
| orientation | 指導 |
| ovation | 大喝采 |
| participation | 参加 |
| perspiration | 発汗 |
| plantation | 大農園 |
| population | 人口 |
| precipitation | 落下 |
| preparation | 準備 |
| presentation | 贈呈、提出、発表 |
| preservation | 保存 |
| probation | 試験 |
| proclamation | 宣言 |
| proliferation | 激増 |
| pronunciation | 発音 |
| propagation | 繁殖 |
| provocation | 挑発 |
| publication | 出版 |
| punctuation | 句読点 |
語尾が「-ation」で終わる英単語一覧
