noun which may take the genitive case particle 'no', na-adjective, noun
Formal term for matters requiring immediate attention; often used in news, policy, or business contexts. Functions as a noun or adjectival noun (～な/～の).
喫緊の課題として、少子化対策が挙げられる。
As an urgent issue, measures against the declining birthrate can be cited.
この問題は喫緊に対処
This problem needs to be dealt with urgently.
Compound of 喫 (eat/drink, here used in the sense of 'receive' or 'take on') and 緊 (tight/urgent). The exact historical derivation is uncertain, but the combination conveys a sense of something that must be taken on urgently.