エンジンenjin
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- nounengine
- Synonym発動機はつどうきWritten発動機 is a literary synonym of エンジン; because of its bookish register it appears mainly in formal or written prose, so learners should default to エンジン in conversation.
Use エンジン as the normal word for an engine in everyday speech and writing about cars, planes, and machinery; reserve 発動機 for literary or formal contexts.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


