noun
agent; actor; performer of an action
Linguistics term for the entity that performs or initiates an action, often contrasted with the patient or experiencer.
受動文では、動作主は「に」で示されることが多い。
In passive sentences, the agent is often marked by 'ni'.
この動詞の動作主は人間に限られる。
The agent of this verb is limited to humans.
主語 is a grammatical subject, which may not always be the agent; 動作主 is a semantic role.
Compound of 動作 (action, movement) and 主 (master, main entity). A straightforward kanji compound for the linguistic concept of agent.