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
factorial (n.)
[factorial 词源字典]
1816, in mathematics, from
factor
+
-al
(2). As an adjective from 1837 in mathematics; from 1881 as "pertaining to a factor."
[factorial etymology, factorial origin, 英语词源]
[factorial 词源字典]