- 第三方 dìsānfāng third party
- 第三季度 dìsānjìdù third quarterthird quarter (of a financial year)
- 第三产业 dìsānchǎnyè tertiary sectorthe tertiary sector of industry (service industry)
- 第三者 dìsānzhě number threeThe third person or item in a list, sequence, or series.
- 第三位 dìsānwèi third place
- 第三世界 dìsānshìjiè Third World
- 第三纪 dìsānjì Tertiarygeological era since the extinction of the dinosaurs at the Cretaceous-Tertiary boundary 65 million years ago
- 第三声 dìsānshēng third toneThe third of the four main tones in Mandarin Chinese, typically characterized by a falling-rising pitch contour.
- 第三帝国 Dìsān Dìguó Third ReichThe Third Reich; the Nazi regime in Germany from 1933 to 1945.
- 第三地 dìsāndì third territoryterritory belonging to a third party, often used as a neutral location for negotiations or a transit point for indirect travel or trade
- 第三人称 dìsānrénchēng third personthird person (grammar)
- 第三状态 dìsānzhuàngtài suboptimal healthsuboptimal health status
- 第三眼睑 dìsānyǎnjiǎn nictitating membrane