中ちゅう項こう

noun

mean; middle term

Mathematical term for the middle term in a proportion or sequence; used in contexts such as 比例中項 (geometric mean) or 等差中項 (arithmetic mean).

• 比ひ例れい中ちゅう項こうを求もとめる公こう式しきを覚おぼえていますか。

  Do you remember the formula for finding the geometric mean?

• この数すう列れつの等とう差さ中ちゅう項こうは5です。

  The arithmetic mean of this sequence is 5.