trzynasta

In a sentence

• Idziemy na spacer około trzynastej.

  We are going for a walk around the thirteenth hour.

  In this sentence, 'trzynasta' is used to denote the time '13:00' or '1:00 PM', often used in Polish to refer to hours of the day in a 24-hour clock format.

• Trzynasta mieszka na drugim piętrze.

  The thirteenth lady lives on the second floor.

  Here, 'trzynasta' is used as an ordinal number to refer to the thirteenth instance in a sequence, in this case, the thirteenth person

• To jest trzynasta książka w serii.

  This is the thirteenth book in the series.

  In this example, 'trzynasta' functions as an ordinal number describing the position of an item in a sequence, specifically the thirteenth book in a series.