This glossary is a work in project. Any and all suggested additions are welcome.
| Term | 和訳 | Definition |
| Adjectival Noun/Verb | 形容動詞 | A word that describes an attribute while also being noun-like but requires being coupled with the copula verb to conjugate, which is where the Japanese terminology “adjectival verb” derives. |
| Adnominal Adjective | 連体詞 | A word that describes an attribute by directly modifying a noun but has lost (or never had) the ability to conjugate into other forms. |
| Agent | 動作主 | The doer of an action. The agent is marked by が in non-passive sentences, but in passive(-like) sentences, it will be marked with に or から. |
| Agglutination | 膠着性 | Japanese is known as an agglutinative language (膠着語) because of the way verbal morphology is centered around a root which then takes on other affixes in a chain, with said affixes being easily identifiable to indicate a particular inflection. |
| Ancillary Word | 付属語 | A morpheme (unit of meaning) which cannot stand alone, including auxiliaries, prefixes, suffixes, particles, etc. |
| Auxiliary | 助動詞 | An affix/ending used in constructing conjugations. Auxiliaries themselves may conjugate as adjectives or verbs, but both types are referred to as literally “helper verbs” in Japanese. |
| Base | 活用形 | One of six forms that the root of a conjugatable part of speech may take. |
| Copula | コピュラ | An auxiliary which connects the subject and the predicate. In Japanese, the auxiliary だ (and its alternative forms) is known as the auxiliary verb, but other affixes such as ～らしい, ～ようだ, ～そうだ, etc. are also referred to as copular auxiliaries. |
| Dependent Clause | 従属節 | Also known as a “subordinate clause,” a dependent clause is a group of words that contains a subject and verb but does not constitute a sentence that can standalone. |
| Dialect | 方言 | A form of a language spoken by people in a particular part of a language domain that is still understood by speakers of other groups in said language domain. |
| Direct Object | 直接目的語 | A phrase that is primarily being affected by the verb |
| Etymology | 語源学 | The study of where words derive from, including both how words are constructed within a language as well as whether said word originates from another language. |
| Grammatical Person | 人称 | The grammatical distinction between those speaking (first person), those being addressed (second person), and those who are neither speaking nor being addressed (third person); in Japanese, such distinctions are not represented in verbal morphology. |
| Idiom | 慣用句 | Also known as a “set phrase,” an idiom is a phrase whose meaning cannot be deduced from the individual words that compose it. |
| Independent Word | 自立語 | A morpheme (unit of meaning) whose meaning can be deduced in isolation (standing alone) and may also be used independently of other morphemes. |
| Indirect Object | 間接目的語 | A phrase referring to something/someone that is a recipient of some action |
| Intransitive Verb | 自動詞 | A verb that only takes a subject. Instances of ergativity manifest as intransitive verbs, resulting in their objects being marked in the same way as intransitive verb subjects. Abbreviated in definitions as “intr.” |
| Inversion | 倒置法 | The phenomenon of stating the predicate first, followed by the rest of the constituents of a sentence, whose word order will not be altered as an effect of said inversion. |
| Japonic | 日琉語族 | Also known as Japanese-Ryukuan, is the language family comprising Japanese as well as very closely related languages spoken throughout Okinawa Prefecture. |
| Main Clause | 主節 | Also known as a “principle clause” or “independent clause,” the main clause of a sentence constitutes the subject and the predicate of the sentence. Whether or not other clauses are added does not change how the “main clause” may stand alone as a complete sentence. |
| Modifier | 修飾語 | A phrase which qualifies another phrase. In Japanese, modifiers precede the modified word by default. |
| Mora | 拍 | The basic timing unit of Japanese phonology, as opposed to syllables, instead splitting up sound units by perceived equal lengths. In doing so, CV and the uvular /N/ are rendered as single mora, and ‘long’ consonants and vowels are rendered as bimoraic. |
| Non-Past Form | 非過去形 | The Japanese equivalent of both the present tense and future tense, with contextual and syntactic clues indicating which interpretation is intended. |
| Object | 目的語 | A noun that is directed by the main verb of the sentence. |
| Omission | 省略 | Contextually based omissions from a sentence, a feature of Japanese grammar which English does not generally share. |
| Particle | 助詞 | Also colloquially referred to as てにをは, particles constitute a part of speech composed of morphemes which indicate some grammatical function. |
| Predicate | 述語 | The predicate is the part of a sentence or clause containing a verbal element which states something about the subject. In Japanese, predicates may be composed of verbs, adjectives, and the copula verb, all of which use parallel morphology to conjugate. |
| Self-Control | 自己制御性 | The concept of “self-control” pertains to how much willpower/volition the agent of an action actually has over a given situation, and this level of self-control will naturally differ between semantic verb classes. |
| Subject | 主語 | The “what” of the sentence, which could be “who” is doing an action, “what” holds a certain attribute or effect, but is more than anything what the predicate is about. |
| Topic | 主題 | The topic is any detail that the speaker views is at the center of discussion. It is possible to have more than one constituent of a sentence topicalized (made into the topic). |
| Transitive Verb | 他動詞 | A verb that takes both a subject and an object. Abbreviated in definitions as “trans.” |
| Volition | 意志 | A lot of grammar points hinge on whether there the agent has “willpower”, a.k.a, “volition” to perform said action. |
The Six Bases 六つの活用形
- Mizenkei 未然形 (Irrealis Form): Used to indicate actions that have yet to happen.
- Ren’yōkei 連用形 (Continuative Form): Used to indicate actions that are (being) carried out.
- Shūshikei 終止形 (Terminal Form): Used to mark the end of a complete sentence.
- Rentaikei 連体形 (Attributive Form): Used to create modifiers out of verbs/adjectives.
- Kateikei 仮定形 (Hypothetical Form): Used to create hypothetical statements.
- Meireikei 命令形 (Imperative Form): Used to create commands.
In Classical Japanese, the 仮定形 is referred to as the Izenkei 已然形 (realis form), not because of structural change to the base itself, but because of how it was the exact opposite of the 未然形 (irrealis form) in interpretation – denoting established cause and effect.
Speech Registers 文体の種類
| SPEECH REGISTER | SPEAKER-LISTENER RELATIONSHIP |
| Honorific Speech (尊敬語) | Used to show utmost respect to the listener. |
| Polite Speech (丁寧語) | Colloquially also known as です・ます体, it is used to establish respect among equals who are not necessarily family or friends. |
| Humble Speech (謙譲語) | Used to lower one’s status to show utmost respect to the listener. |
| Plain Speech (常体語) | Also known as だ体, plain speech (basic) forms play grammatical purposes beyond register, but it also constitutes the register used among friends and family. タメ口 may also refer to this speech register in the context of familial speech between close individuals. |
| Vulgar Speech (侮蔑語) | Used to degrade the listener. |
Kinds of Particles 助詞の種類
- Case: (Kaku joshi 格助詞): Indicates the grammatical function of a noun.
- Parallel: (Heiritsu joshi 並立助詞): Juxtaposes two or more things together.
- Conjunctive (Setsuzoku joshi 接続助詞): Connects clauses together.
- Final (Shū-joshi 終助詞): Placed at the end of a phrase to provide emotional context.
- Adverbial (Fuku-joshi 副助詞): Indicates degree/condition/circumstance.
- Bound (Kakari joshi 係助詞): Emphasis markers which dictate that a certain conjugation be used.