再利用（さいりよう、sairiyou）
- reuse

The Japanese word 再利用 (さいりよう) means "reuse," "reutilization," or "recycling." It refers to the act of using something again, either for its original purpose or for a different purpose, after it has already been used once. The core concept involves giving a second life to an item or material, reducing waste and conserving resources. This can range from using a plastic bottle multiple times to repurposing old clothes. The word emphasizes the process of 再利用, making it a valuable term in discussions about environmental conservation and sustainability.

⚫︎ペットボトルの再利用 Translation: Reuse of plastic bottles. ⚫︎古着を再利用して、新しいデザインの服を作る Translation: Reuse old clothes to create clothes with new designs. ⚫︎ゴミを再利用するための方法を考える Translation: Consider methods for recycling waste.

You use 再利用 when talking about the act of reusing something. It's often used in contexts of environmental protection, resource management, and sustainable practices. You can use it in formal and informal conversations. For example, if discussing environmental initiatives, describing methods for reducing waste, or even explaining how you are repurposing items in your home. The verb form is 再利用する (さいりようする - to reuse) and the noun form is 再利用 (さいりよう - reuse).

再利用 is typically written in kanji and hiragana. ・Kanji: 再利用 ・Hiragana: さいりよう The okurigana (the suffix hiragana) is consistent: 利用 always ends in よう. The kanji 再 indicates "again" or "re-". There are no other standard ways to write this word.

There aren't many direct synonyms, but related words include: ⚫︎リサイクル (risaikuru) - recycling (specifically referring to processing materials to make new products.) ⚫︎再使用 (さいしよう - resuse) - also meaning reuse, though perhaps slightly less common than 再利用. ⚫︎転用 (てんよう - repurposing) - using something for a different purpose.

⚫︎廃棄 (はいき - disposal/discarding) - throwing something away. ⚫︎使い捨て (つかいすて - disposable/single-use) - using something once and then discarding it.

資源を有効活用するために、積極的に商品の再利用を進めています。 ・Translation: To effectively utilize resources, we are actively promoting the reuse of products. ・Explanation: This sentence highlights the importance of 再利用 for resource conservation.

この会社は、古くなったコピー用紙を再利用して、メモ帳を作っています。 ・Translation: This company reuses old copy paper to make memo pads. ・Explanation: This sentence demonstrates a practical example of 再利用 in a business setting.

The word 再利用 is formed from two kanji: 再 (さい or ふたた) meaning "again" or "re-", and 利用 (りよう) meaning "use" or "utilization". Therefore, 再利用 literally means "to use again." This construction is a common pattern in Japanese, where combining kanji creates new compound words with specific meanings.