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This site will be taken down March 31st, 2026.

This was not an easy decision to make. For the last couple years, I have been struggling to find motivation for this site and to keep up with basic maintenance and security updates. With the rise of AI and more sophisticated tools, the usefulness of sites like this is questionable and traffic has nose-dived. I just don't have it in me to keep doing this. Thank you all for 10 years of support!

Zach

未知数

Reading

Kana: みちすう
Romaji: michisuu
Kana
Romaji

Definition

noun
1

unknown number; unknown quantity; variable

(Mathematics)
See also: 既知数

Kanji

未
Readings: ミ、 ビ、 いま.だ、 ま.だ、 ひつじ
Meanings: un-, not yet, hitherto, still, even now, sign of the ram, 1-3PM, eighth sign of Chinese zodiac
知
Readings: チ、 し.る、 し.らせる
Meanings: know, wisdom
数
Readings: スウ、 ス、 サク、 ソク、 シュ、 かず、 かぞ.える、 しばしば、 せ.める、 わずらわ.しい
Meanings: number, strength, fate, law, figures

Example Sentence

Ｘ記号(きごう)は数学(すうがく)ではたいてい未知数(みちすう)を表(あらわ)す。
➥The symbol "X" usually stands for an unknown quantity in mathematics.
Full Entry➤