解約（かいやく、kaiyaku）
- cancellation

The Japanese word 解約 (読み方：かいやく, *kaiyaku*) generally means "cancellation," "termination," or "rescission" of a contract or agreement. It implies ending a previously established agreement, such as a subscription, contract, or reservation. 解約 is a formal term and is commonly used in business or legal contexts. It signifies the official ending of the binding agreement.

⚫︎ 契約を解約する。 Translation: To cancel a contract. ⚫︎ 携帯電話のプランを解約したいです。 Translation: I want to cancel my mobile phone plan. ⚫︎ 定期購読を解約する手続きをする。 Translation: To go through the procedure to cancel a subscription.

You use 解約 when you want to explicitly state the termination or cancellation of a contract or service. It's suitable for both written and spoken Japanese, especially in formal situations. Use this term when you are dealing with official documents, communicating with companies about subscriptions, or discussing legal matters. It is appropriate when you need to formally end an existing agreement.

解約 is written using the kanji 解（*kai*, meaning "to solve," "to untie," or "to cancel") and 約（*yaku*, meaning "promise," "contract," or "agreement"). ⚫︎ It is usually written in kanji. ⚫︎ The reading is かいやく (*kaiyaku*) in hiragana. ⚫︎ There are no significant variations in the okurigana.

⚫︎ キャンセル (*kyanseru*): Cancellation (loanword from English), used more casually. ⚫︎ 契約解除（*keiyaku ka jo*): Contract termination. (more formal) ⚫︎ 破棄（*haki*): breaking; rejection, (mostly used in legal contexts)

⚫︎ 契約（*keiyaku*): contract, agreement ⚫︎ 締結（*teiketsu*): conclusion; signing; entering into (a contract)

サービスの利用を解約したい場合は、以下の手順に従ってください。 ・Translation: If you want to cancel the service, please follow the steps below. ・Explanation: This sentence explains the process to be followed when canceling a service.

もし、解約料が発生する場合は、事前に通知いたします。 ・Translation: If a cancellation fee applies, we will notify you in advance. ・Explanation: This sentence explains about a cancellation fee if one applies.

The word 解約 is formed from the combination of two kanji: 解（*kai*）meaning "to solve," "to untie," or "to cancel," and 約（*yaku*）meaning "promise," "contract," or "agreement." The combination of these two characters creates the meaning of "to dissolve" or "to cancel" an existing contract or agreement.