quword
趣词
Word Origins Dictionary
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
a.m.
in reference to hours, 1762, abbreviation of Latin
ante meridiem
"before noon."
A.M.
also
AM
, type of radio wave broadcast, 1921, abbreviation of
amplitude
modulation
.