原付（げんつき、gentsuki）
- moped

The Japanese word 原付 (げんつき) is a shortened form of 原動機付自転車 (げんどうきつきじてんしゃ), which translates to "motorized bicycle" or "moped". It specifically refers to a small, two-wheeled vehicle with an engine, typically a scooter or moped, with an engine displacement of 50cc or less. These vehicles are common in Japan and are subject to specific regulations. They are also known as "Class 1 Motorized Bicycles" due to their engine capacity. This is often written as 原付 or sometimes abbreviated as 50cc. The vehicles must follow similar rules as motorcycles such as requiring a license and registration. The term can be applied to many different kinds of small motor vehicles as long as they meet the criteria of having an engine displacement of 50cc or less. However, the term is mainly used to describe a scooter or moped.

⚫︎原付に乗ってコンビニに行きました。 Translation: I went to the convenience store on a moped. ⚫︎ 彼は新しい原付を買いました。 Translation: He bought a new moped. ⚫︎ 原付の免許を取得する必要があります。 Translation: You need to get a moped license.

This word is commonly used in everyday conversation and in written Japanese. ⚫︎ Use it when referring to mopeds or small scooters. ⚫︎ You can use it when talking about the vehicles themselves, or about regulations or activities related to them (e.g., driving, getting a license, buying one, etc.). ⚫︎ It is appropriate in a variety of contexts, from casual to more formal situations.

⚫︎ The standard way to write this word is 原付. ⚫︎ The reading is げんつき in hiragana. ⚫︎ The kanji 原 (げん) means "original" or "origin," and 付 (つき) means "attached" or "with." ⚫︎ No other common ways to write this word exist.

⚫︎ 50ccバイク (ごじゅうシーシーバイク) - 50cc bike. ⚫︎ 原動機付自転車 (げんどうきつきじてんしゃ) - Motorized bicycle (the full form).

There aren't specific antonyms in the same sense. However, depending on context, you could contrast it with larger vehicles: ⚫︎ バイク (bike/motorcycle) ⚫︎ 自動車 (じどうしゃ) - car

《原付は、日本の道路でよく見かけます。》 ・Translation: Mopeds are commonly seen on Japanese roads. ・Explanation: This sentence simply states a common observation about the prevalence of mopeds in Japan.

《原付に乗るには、免許が必要です。》 ・Translation: You need a license to ride a moped. ・Explanation: This sentence explains a legal requirement.

The word 原付 is a shortening of 原動機付自転車 (げんどうきつきじてんしゃ). 原動機 (げんどうき) means "prime mover" or "engine," and 付 (つき) means "attached." 自転車 (じてんしゃ) means "bicycle". Therefore, 原付 is a concise way to refer to these motorized bicycles, encapsulating the key characteristics of the vehicle.