For the first time.
Before anything else; firstly.
Now.
first base
A first-edition copy of some publication.
A fraction whose (integer) denominator ends in the digit 1.
The first gear of an engine.
Something that has never happened before; a new occurrence.
A first-class honours degree.
The person or thing in the first position.
Preceding all others of a series or kind; the ordinal of one; earliest.
Of or belonging to a first family.
Most eminent or exalted; most excellent; chief; highest.
Indicating the most important action.
Indicating the last item.
Used to indicate the etymon at which a given etymological derivation terminates.