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A 
  symbol for 
1  (Music) 
a a note having a frequency of 440 hertz (A above middle C) or this value multiplied or divided by any power of 2; the sixth note of the scale of C major 
b a key, string, or pipe producing this note 
c the major or minor key having this note as its tonic 
2 a human blood type of the ABO group, containing the A antigen 
3 (in Britain) a major arterial road 
the A3 runs from London to Portsmouth  
4  (formerly, in Britain) 
a a film certified for viewing by anyone, but which contains material that some parents may not wish their children to see 
b (as modifier) 
an A film  
5 mass number 
6 the number 10 in hexadecimal notation 
7  (Cards) ace 
8 argon (now superseded by Ar) 
9 ampere(s) 
10  (Also)  at ampere-turn 
11 absolute (temperature) 
12 (in circuit diagrams) ammeter 
13 area 
14 in combination atomic 
an A-bomb, an A-plant  
15  (Chem) affinity 
16  (Biochem) adenine 
17  (Logic) a universal affirmative categorical proposition, such as all men are mortal: often symbolized as SaP 
 Compare  →  E  →  I 2  →  O 1 
  (from Latin a(ffirmo) I affirm) 
18 
a a person whose job is in top management, or who holds a senior administrative or professional position 
b (as modifier) 
an A worker   (See also)   →  occupation groupings 
19 
  international car registration for Austria 



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