決定をする

You take the noun 決定 (decision) and add the verb する (to do). You can keep the particle を in the middle for emphasis. Or you can drop it to say 決定する for speed. Use the past tense 決定した when the choice is finished. If you want to be polite, use 決定しました. It is a very versatile structure for any serious situation.

Use this in business meetings when a project is approved. Use it for big life events like choosing a university. It is perfect for wedding planning or buying a house. It sounds professional, clear, and very decisive. If you tell your boss 決定しました, they know the matter is closed. It works well in formal emails and official announcements too. You will sound like someone who gets things done.

Do not use it for tiny, daily things. Like choosing between a latte or a mocha. That sounds way too dramatic for a coffee shop. For small daily choices, use 決める instead. Using 決定をする for a sandwich choice might make your friends laugh. It is like calling a formal press conference for a snack. Keep it for the things that actually matter.

In Japan, decisions often take a lot of time. People like to reach a consensus first. This process is called nemawashi. Once everyone finally agrees, the 決定 is made. It represents the final step of a long group process. It is about stability and group harmony. Making a 決定 means everyone is now moving in the same direction. It is a powerful moment in a Japanese company.

You will often hear 決定しました in the office. In casual talk, you might hear 決定だね which means 'It's a done deal!' If you want to be very polite, use 決定いたしました. There is also 最終決定, which means 'final decision.' It sounds very cool and definitive. You might see 決定事項 on a meeting agenda. That means 'items already decided.'