Preceding all others in time
At or near the start of a period, development, or series
Most important, influential, or significant
Foremost in order
Foremost in importance
It was the first money that he had ever had.
First it was the inheritance thing.
The first cars were called "horseless carriages."
Still, it was her first car and one with memories packed into it.
First, many things in the physical world that we think of as scarce are not really scarce, just presently beyond our ability to capture.