1.NounAn irrational number that is the solution of a quadratic equation of the form
a
x
2
+
b
x
+
c
=
0
{\displaystyle ax^{2}+bx+c=0}
, where
a
{\displaystyle a}
,
b
{\displaystyle b}
, and
c
{\displaystyle c}
are integers and
a
{\displaystyle a}
≠
0
{\displaystyle 0}
.