正(せい)

せい
noun, prefix
positive (sign), plus; correct
number
1. positive (mathematical sign), plus
The positive sign (+) in mathematics. Opposite of 負(ふ) (negative).
正(せい)の数(すう)。
A positive number.
正(せい)の符号(ふごう)と負(ふ)の符号(ふごう)。
Positive sign and negative sign.
2. correct, right, legitimate
Indicates something is correct, proper, or legitimate.
正(せい)解(かい)。
Correct answer.

正(せい) is used as a prefix or noun meaning "positive" (math) or "correct/official."

Math usage

MEANING "CORRECT/OFFICIAL":

Confusion alert

These homophones are common sources of confusion.

Related Words

Antonym: 負(ふ) (negative, minus)
Compare: 真(しん) (truth)
general
Added 2026.2.2 19:21 · Revised 2026.9.2 13:01
09500/09511_sei