Uni-, Bi- Combined Set

Uni-

Prefix meaning one

unicellular (adj)

having only one cell

unicorn (n)

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

unicycle (n)

a one-wheeled vehicle on which the rider sits and pedals

unidirectional (adj)

moving in only one direction

unify (v)

to join together into one group

unilateral (adj)

one sided

unique (adj)

one of a kind; unusual or rare

unison (n)

an instance of saying the same words or sounds at the same time; group that sounds like one

unit (n)

one group

unitard (n)

a one-piece leotard and tights combination

Bi-

prefix meaning two

bicolor (adj)

having two different colors

bicuspid (n)

a two-pointed tooth located in the side of the jaw

bicycle (n)

a vehicle with two wheels

biennial (adj)

happening every two years

bifocals (n)

eyeglasses with lenses that have two different sections- for seeing close up and far away

bilingual (adj)

able to speak two different languages

bimonthly (adj)

happening every two months

biped (n)

a two-footed creature

biplane (n)

an airplane with two pairs of wings

biweekly (adj)

happening every two weeks

pre-

before

post-

after

poly-

many