uni-
One

having only one cell
unicellular

a horse-like fabled animal that has one horn growing out of the middle of its forehead
unicorn (n)

a one-wheeled vehicle on which the rider sits and pedals
unicycle (n)

moving in only one direction
unidirectional (adj)

to join together into one group
unify (v)

one sided
unilateral (adj)

one of a kind; unusual or rare
unique (adj)

an instance of saying the same owrds or sounds a the same time; a group that sounds like one
unison (n)

one group
unit (n)

a one-piece leotard and tights combination
unitard (n)
