The first house on your left.
The first day of spring.
Was first in the class.
First daughter Sasha Obama.
Arrived first; forgot to light the oven first.
To plunge into a pool feet first.
Would die first.
From the first; at first.
Finished the season in first.
The first day of September 2013 was a Sunday. I was the first runner to reach the finish line, and won the race.
Clean the sink first, before you even think of starting to cook.
Demosthenes was the first orator of Greece.
He was the first to complete the course.
An example of first is a first child, a child born before their siblings.
This is a first. For once he has nothing to say.
There was a close play at first.
One forty-first of the estate.