na-adjective, noun which may take the genitive case particle 'no', noun
General term for the highest degree or limit of something. Can be used as a noun, adjectival noun (na-adjective), or prenominal (no-adjective).
この機械は極大の出力を発揮する。
This machine delivers maximum output.
極大な努力が必要だ。
Extreme effort is required.
noun
local maximum
Mathematics term for a local maximum of a function.
この関数の極大値を求めなさい。
Find the local maximum of this function.