Meaning of “second” - Learner’s Dictionary

second

adjective, pronoun us uk /ˈsekənd/
AFTER FIRST

A1 referring to the person, thing, or event that comes immediately after the first:

You're second on the list.
This is my second piece of chocolate cake.
She didn't win but she did come second (= was the one after the winner) in one race.

More examples

NUMBER

(Definition of “second adjective, pronoun” from the Cambridge Learner’s Dictionary © Cambridge University Press)