第一

Noun

 * 1)  first; 1st
 * 2) number one; #1; first
 * 1) number one; #1; first
 * 1) number one; #1; first
 * 1) number one; #1; first
 * 1) number one; #1; first
 * 1) number one; #1; first
 * 1) number one; #1; first
 * 1) number one; #1; first

Adverb

 * 1) firstly
 * 2) being the most important consideration; being essential, or a priority; coming first
 * 3)  most
 * 1)  most

Etymology
From. First attested in a text from 772.

Noun

 * 1)  first, foremost, number one