noun, noun which may take the genitive case particle 'no'
Ordinal number 'third'. Used as a noun or with の to modify another noun (e.g., 第三の選択).
彼は第三の候補者として選ばれた。
He was chosen as the third candidate.
第三の問題は最も難しい。
The third problem is the most difficult.
Variant using Arabic numeral 3; common in lists, tables, or informal writing.
Compound of prefix 第 (ordinal marker) and 三 (three).