used to talk about the beginning of a situation, especially when it is different now:
At first, Gregory was shy and hardly spoke.
I felt quite disappointed at first.
2 [countable usually singular]
something that has never happened or been done before
The 3-0 defeat was a first for the team.
These results are firsts in the history of women's athletics.
'I think he'll agree to it.' 'That will be a first.'
from the beginning of a situation:
I was against the idea from the first.
I should have known from the first that the relationship would never work.
the highest mark you can get in a university degree in Britain:
Helen got a first in Law.