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unicorn
a horse-like fabled animal that has one horn growing out of the middle of its forehead
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unicycle
a one-wheeled vehicle on which the rider sits and pedals
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unison
an instance of saying the same words or sounds at the same time; a group that sounds like one
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unilateral
one sided
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unique
one of a kind; unusual or rare
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unify
to join together into one group
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unidirectional
moving in only one direction
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unitard
a one-piece leotard and tights combination
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unit
one group
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unicellular
having only one cell