Ordinal numbers with "di"

Potential articles / sections

• Ordinals formed with 第
• Some nouns can take ordinal numbers without 第, e.g. 月, 楼, 层, 姐, 弟. In this case measure words are necessary to indicate quantities.
• Siblings can be referred to be 老 followed by a number indicating which child they are in sequence. E.g. 老二 is the second child. The eldest child is referred to as 老大.

AKA: ordinals

Sources

外国人实用汉语语法(中英文对照) (pp. 58 - 73)