Highest power of a variable in a polynomial is the degree of a polynomial.

Eg:- x
^{
3
}
− 3x
^{
2
}
+ 4x + 10

Degree = Highest power = 3

Eg:- 30x
^{
4
}
+ 5x
^{
3
}
− 10x
^{
5
}
+ 41

Degree = Highest power = 5