Translation guide
The English word "classification" covers several related ideas: assigning categories, the resulting system of categories, and the act of sorting items into groups. Japanese uses different words depending on the nuance.
The process of sorting items into groups or assigning categories.
The most common and general term for classification, used for sorting things into categories.
本をジャンル別に分類する。
Classify books by genre.
この図書館の分類方法は独特だ。
The classification system of this library is unique.
Emphasizes dividing or separating into distinct groups, often used for administrative or formal divisions.
土地を用途別に区分する。
Classify land by use.
Often used for sorting physical items, like mail or goods, or in accounting for categorizing transactions.
郵便物を仕分けする。
Sort the mail.
Similar to 分類 but less common; often used in formal or technical contexts.
標本を類別する。
Classify the specimens.
The resulting set of categories or the structure used to organize things.
Also used for the classification system itself.
この分類はわかりやすい。
This classification is easy to understand.
Can refer to the divisions or categories themselves, especially in formal contexts.
Technical or domain-specific classification systems.
Used in biology (taxonomy), library science, and other fields.
このキノコは分類が難しい。
This mushroom is difficult to classify.
Classification by type or kind, often used in technical or official documents.
Refers to rating or grading classification, like credit ratings or quality grades.
Referring to information that is restricted or secret.
The act of designating something as classified.
その文書は機密指定されている。
The document is classified.
Security classification level, like top secret or confidential.
この情報の秘密区分は「極秘」だ。
The classification of this information is "top secret."
分類 (ぶんるい) is the most general term for classification into categories. 区分 (くぶん) emphasizes dividing into distinct sections or groups, often used in administrative or formal contexts. 仕分け (しわけ) is used for physically sorting items or in accounting for categorizing transactions.
When talking about classified information (secret/top secret), use 機密指定 (きみつしてい) or 秘密区分 (ひみつくぶん). Using 分類 in this context would be unnatural.
Explicitly refers to a classification system or taxonomy.
生物の分類体系を学ぶ。
Learn the classification system of living things.
Tabulate by age classification.
Check the vehicle classification.
このホテルは五つ星の格付けを得た。
This hotel received a five-star classification.