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Noun:
A4
A
common
standard
paper
size
(21.0 x 29.7 cm);
half
the
area
of A3,
twice
area
of A5
Type of:
format
Encyclopedia:
A4
A.D.
A.E.
a.k.a.
A.M.
a.m.
A/C
A0
A1
A2
A3
A4
A5
A6
aa
AA
AAA
AAAS
AAC
Aachen
aah
Aaland islands