noun which may take the genitive case particle 'no', na-adjective, noun
superior; first-class; excellent; top quality
Describes something of high grade, quality, or rank. Used as a noun, no-adjective, or na-adjective.
この店は上等な食材だけを使っている。
This shop uses only top-quality ingredients.
彼は上等のスーツを着て面接に行った。
He went to the interview wearing a first-class suit.
interjection
bring it on!; just fine!
Interjection used to accept a challenge or express defiant approval, often in a rough or casual tone.
「お前、やる気か？」「上等だ、かかってこい。」
"You wanna fight?" "Bring it on, come at me."