The time of the present church's construction cannot be exactly defined.

But no picture can exactly define every point in an infinite set.

Therefore, what a patient experiences before, during and after an attack cannot be defined exactly.

Under computer control, these should exactly define the imaging surface.

It is difficult to exactly define the meaning of 'reasonable force'.

I want it better stated; its conditions modified, defined exactly.

What exactly defines a "Year" for a satellite of a planet?

I wish somebody here would define exactly what misogyny is!

This is a space within a space, created with exactly defined purpose.

Lines in the projective plane are defined exactly as above.