“7th” (seventh) means:

• The ordinal form of 7, showing position in a sequence.
  • Example: He finished 7th in the race = he came in position number seven.
• It can also refer to:
  • The 7th day of a month (e.g., July 7th)
  • The seventh item, rank, or place in an ordered list

In short, it means number seven in order or rank.