Definition of: tower

(tou′ər) noun
1. A structure very tall in proportion to its other dimensions, and frequently forming part of a large building; properly, a structure larger than a pinnacle, and less tapering than a steeple.
2. A tall, wooden, movable structure from which besiegers formerly stormed a fortress.
3. A place of security or defense; fortified place; citadel.
—v.i.
1. To rise or stand like a tower; extend to a great height.
2. To fly directly upward, as some birds. [Fusion of OE torr (<L turris) and OE tūr <OF tor, tur <L turris]