A/DabbreviationElectronicsanalogue to digital.A1(alsoa)
noun(pluralAsorA's)
1the first letter of the alphabet.
2denoting the first, best, or most important in a set.
3Musicthe sixth note of the diatonic scale of C major, having a standard frequency of 440 Hz.
4the human blood type (in the ABO system) containing the A antigen and lacking the B.
Phrases
from A to Bfrom one's starting point to one's destination.
from A to Zover the entire range.A2abbreviation
1(in card games) ace.
2(in showing goals or points conceded) against.
3ampere(s).
4(Å) ångström(s).
5answer.
6(in names of sports clubs) Athletic.
7attack (in designations of US aircraft types):an A-10.
8Austria (international vehicle registration).D/AabbreviationElectronicsdigital to analogue.
