What is angular velocity equal to? It's a formula about time t

What is angular velocity equal to? It's a formula about time t

The angular velocity W is equal to the rotation angle D divided by the time t, that is, w = D / T
For uniform circular motion, if you rotate one circle, the rotation angle is 360 degrees, which is expressed as 2 π in radians,
If the period is t and the time taken is t, then w = 2 π / T