theoretical

We may look upon this figure as representing in section a theoretical wing-form, or aerofoil

Which makes the concept known as Rods From God the ultimate form of kinetic weaponry. This theoretical weapon would drop telephone pole sized rods of dense tungsten from a satellite in orbit.

This meeting is a waste of time. Everybody is just talking in vague theoretical terms.

That shows his theoretical background.

The Greeks made theoretical models of geometry.

Theoretical physics was child's play to Einstein, but he couldn't figure out his income tax.