A tower is a tall structure, with the diameter of its base less than its height. Rapunzel lived in a tower. If you have a super tall friend and you're short, you could say they tower over you.

Towers can come in handy––you can build one and climb to the top, looking out for approaching enemies, or in the case of a fire tower, for early signs of forest fires. One of the most famous towers is the Tower of London, with its long-held reputation as a place of torture and execution. Most people are surprised to learn that only seven people were executed in the Tower.

Definitions of tower
  1. noun
    a structure taller than its diameter; can stand alone or be attached to a larger building
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    CN Tower
    a tower in Toronto; 1815 feet tall for broadcasting widely
    Eiffel Tower
    a wrought iron tower 300 meters high that was constructed in Paris in 1889; for many years it was the tallest man-made structure
    Space Needle
    a tower 605 feet tall in Seattle; a tourist attraction
    Leaning Tower of Pisa
    a tall round marble campanile in Pisa that is not perpendicular; construction was begun in 1174
    Tower of Pharos
    a great lighthouse (500 feet high) built at Alexandria in 285 BC
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    barbacan, barbican
    a tower that is part of a defensive structure (such as a castle)
    beacon, beacon light, lighthouse, pharos
    a tower with a light that gives warning of shoals to passing ships
    bell tower
    a tower that supports or shelters a bell
    church tower
    the tower of a church
    clock tower
    a tower with a large clock visible high up on an outside face
    control tower
    a tower with an elevated workspace enclosed in glass for the visual observation of aircraft around an airport
    high-rise, tower block
    tower consisting of a multistoried building of offices or apartments
    slender tower with balconies
    mooring mast, mooring tower
    a tower for mooring airships
    power pylon, pylon
    a large vertical steel tower supporting high-tension power lines
    a tower for guiding pilots or marking the turning point in a race
    shot tower
    tower of a kind once used to make shot; molten lead was poured through a sieve and dropped into water
    a cylindrical tower used for storing silage
    spire, steeple
    a tall tower that forms the superstructure of a building (usually a church or temple) and that tapers to a point at the top
    supporting tower
    a tower that serves to support something
    a small tower extending above a building
    an observation tower for a lookout to watch over prisoners or watch for fires or enemies
    belfry, campanile
    a bell tower; usually stands alone unattached to a building
    fire tower
    a watchtower where a lookout is posted to watch for fires
    (architecture) a slender upright spire at the top of a buttress of tower
    a supporting tower used to support a bridge
    type of:
    construction, structure
    a thing constructed; a complex entity constructed of many parts
  2. noun
    anything that approximates the shape of a column or tower
    “a tower of dust rose above the horizon”
    synonyms: column, pillar
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    a small column (or structure resembling a column) that is a part of a plant or animal
    (geology) a column of weathered and unusually shaped rock
    type of:
    form, shape
    the spatial arrangement of something as distinct from its substance
  3. verb
    appear very large or occupy a commanding position
    synonyms: hulk, loom, predominate
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    type of:
    lift, rear, rise
    rise up
  4. noun
    a powerful small boat designed to pull or push larger ships
    synonyms: towboat, tug, tugboat
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    type of:
    a small vessel for travel on water
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