A 1
(also a )
■ noun ( plural As or A's )
1》 the first letter of the alphabet.
2》 denoting the first, best, or most important in a set.
3》 Music the sixth note of the diatonic scale of C major, having a standard frequency of 440 Hz.
4》 the human blood type (in the ABO system) containing the A antigen and lacking the B.
Phrases
from A to B from one's starting point to one's destination.
from A to Z over the entire range.
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A 2
■ abbreviation
1》 (in card games) ace.
2》 (in showing goals or points conceded) against.
3》 ampere(s).
4》 ( Å ) ångström(s).
5》 answer.
6》 (in names of sports clubs) Athletic.
7》 attack (in designations of US aircraft types): an A-10.
8》 Austria (international vehicle registration).