Meaning of FIRST in English

adj foremost; in front of, or in advance of, all others.

2. first ·adj most eminent or exalted; most excellent; chief; highest; as, demosthenes was the first orator of greece.

3. first ·adv before any other person or thing in time, space, rank, ·etc.;

— much used in composition with adjectives and participles.

4. first ·adj preceding all others of a series or kind; the ordinal of one; earliest; as, the first day of a month; the first year of a reign.

5. first ·noun the upper part of a duet, trio, ·etc., either vocal or instrumental;

— so called because it generally expresses the air, and has a preeminence in the combined effect.

Webster English vocab.      Английский словарь Webster.