What does the circled time average notation mean?

[hotjohn]

Homework Statement

what is the meaning of the circled time average there? does it mean ( (ms^-1)(ms^-1) ) /2 ?

Homework Equations

The Attempt at a Solution

does it mean ( (ms^-1)(ms^-1) ) /2 ?

 

[Chestermiller]

No. It means

$$\frac{\int_0^T{u'(t)v'(t)dt}}{T}$$