“2nd” (second) means:

• The ordinal form of 2, showing position in a sequence.
  • Example: She finished 2nd in the race = she came in position number two.
• It can also refer to:
  • The 2nd day of a month (e.g., July 2nd)
  • The second item, rank, or place in an ordered list

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