What is the meaning of the 0.5 power of 5? How to calculate it? I mean the power What about 0.8 power

What is the meaning of the 0.5 power of 5? How to calculate it? I mean the power What about 0.8 power

The 0.5 power of 5 is the root 5
Because the multiplication of two 5's to the power of 0.5 equals 5
A square is the 0.5 power of 5