noun which may take the genitive case particle 'no', noun
the third; tertiary
Used as a prefix-like noun modifier in formal or technical contexts, often in numbered series or classifications.
第三次世界大戦が起こるかもしれないと心配する人もいる。
Some people worry that World War III might break out.
第三次産業はサービス業を中心と
The tertiary industry is centered on the service sector.