虚きょ数すう

noun

imaginary number

Mathematical term for a number whose square is a negative real number. Often introduced alongside complex numbers.

• 虚きょ数すう単たん位い i は、二に乗じょうすると -1 になる数かずです。

  The imaginary unit i is a number that becomes -1 when squared.

• 高こう校こう数すう学がくで虚きょ数すうを初はじめて学まなぶ。

  Students first learn about imaginary numbers in high school math.