HIGHEST

Very elevated; extending or being far above a base; tall; lofty.

"The balloon rose high in the sky.   The wall was high.   a high mountain"

Relatively elevated; rising or raised above the average or normal level from which elevation is measured.

Having a specified elevation or height; tall.

"three feet high   three Mount Everests high"

In or to an elevated position.

"How high above land did you fly?"

In or at a great value.

"Costs have grown higher this year again."

At a pitch of great frequency.

"I certainly can't sing that high."