極大(きょくだい)

きょくだい
noun, no-adjective
maximum; extremely large; local maximum
sciencenumber
1. extremely large; enormous
An extremely large size or magnitude. Used as a no-adjective to describe something of the greatest possible size.
極大(きょくだい)の被害(ひがい)。
Extremely large damage.
台風(たいふう)の影響(えいきょう)は極大(きょくだい)に達(たっ)した。
The impact of the typhoon reached its maximum.
2. local maximum; peak value
In mathematics and science, a point where a function reaches a peak relative to nearby values. Also used for the peak of astronomical events like meteor showers.
関数(かんすう)の極大(きょくだい)値(ち)を求(もと)める。
To find the local maximum of a function.
ペルセウス座(ざ)流星群(りゅうせいぐん)は八月(はちがつ)十二日(じゅうににち)ごろ極大(きょくだい)を迎(むか)える。
The Perseid meteor shower reaches its peak around August 12th.
この関数(かんすう)にはx＝3で極大(きょくだい)、x＝7で極小(きょくしょう)がある。
This function has a local maximum at x=3 and a local minimum at x=7.
太陽(たいよう)活動(かつどう)は約(やく)十一年(じゅういちねん)周期(しゅうき)で極大(きょくだい)と極小(きょくしょう)を繰(く)り返(かえ)す。
Solar activity repeats a cycle of maximum and minimum roughly every eleven years.

A compound of 極(きょく) (extreme, pole) and 大(だい) (large). Can function as a no-adjective: 極大(きょくだい)の.

Usage

Sense 1 (extremely large) is used in general contexts but is fairly formal. Sense 2 (local maximum) is the more common technical usage, appearing in mathematics, physics, and astronomy. In astronomy, 極大(きょくだい) specifically refers to the peak of a periodic phenomenon such as a meteor shower or solar cycle.

Common collocations

Similar words

Related Words

Compare: 最大(さいだい) (greatest, largest)
Antonym: 極小(きょくしょう) (minimum)
Compare: 極限(きょくげん) (limit, extreme)
general
Added 2026.3.31 0:17 · Revised 2026.9.2 13:02
20500/20767_kyokudai