What is the meaning of First?

Preceding all others of a series or kind; the ordinal of one; earliest.

Most eminent or exalted; most excellent; chief; highest.

Of or belonging to a first family.

Coming right after the zeroth in things that use zero-based numbering.

Before anything else; firstly.

For the first time.

Now.

The person or thing in the first position.

The first gear of an engine.

Something that has never happened before; a new occurrence.

first base

A first-class honours degree.

A first-edition copy of some publication.

A fraction whose (integer) denominator ends in the digit 1.

To propose (a new motion) in a meeting, which must subsequently be seconded.

Time; time granted; respite.

first

Source: wiktionary.org