計算機（けいさんき、keisanki）
- calculator

The Japanese word 計算機 (計算機) primarily means "calculator" or "computer". ⚫︎It refers to a device or machine used to perform calculations, ranging from simple arithmetic to complex data processing. ⚫︎In modern usage, it often refers to a digital electronic device.

⚫︎電卓（でんたく）と計算機を使って、数学の宿題をしました。 Translation: I did my math homework using a calculator and a computer. ⚫︎新しい計算機を買う必要があります。 Translation: I need to buy a new calculator. ⚫︎この計算機は複雑なグラフィックも処理できます。 Translation: This computer can also process complex graphics.

⚫︎You can use 計算機 (計算機) when you are referring to a calculator or a computer in general. ⚫︎In everyday conversation, 計算機 is often used to describe a calculator. ⚫︎For a personal computer, the word パソコン is more common. ⚫︎However, in a more technical or formal context, 計算機 is also used to refer to a general-purpose computer.

⚫︎The word 計算機 (計算機) is written using kanji (計算機) and the reading is けいさんき in hiragana. ⚫︎There is no other common way to write this word. ⚫︎The okurigana is fixed (機).

⚫︎電卓（でんたく） - Calculator (specifically a handheld or desktop calculator) ⚫︎コンピュータ - Computer (borrowed from English "computer") ⚫︎パソコン - Personal Computer (personal computer, abbreviation)

There are no direct antonyms as this is a noun.

試験の時、計算機の使用は許可されていません。 ・Translation: The use of calculators is not permitted during the exam. ・Explanation: This sentence illustrates the restriction of using calculators during an exam.

彼は計算機のプログラミングを勉強しています。 ・Translation: He is studying computer programming. ・Explanation: This sentence refers to studying programming which involves usage of a computer.

The word 計算機 (計算機) is composed of two kanji: 計算（けいさん） meaning "calculation" and 機（き）meaning "machine" or "device". Therefore, 計算機 (計算機) literally translates to "calculation machine."