Prefix

Meaning

Examples

A

in, on, of, up, to

abed, afoot

A

without, lacking

atheist, agnostic

Ab

from, away, off

abdicate, abjure

Ad

to, toward

advance

Am

friend, love

amicable, amatory

Ante

before, previous

antecedent, antedate

anti

against, opposing

antipathy, antidote

auto

self

autonomy, autobiography

belli

war, warlike

bellicose

bene

well, good

benefit, benefactor

bi

two

bisect, biennial

bio

life

biology, biosphere

cata

down, away, thoroughly

catastrophe, cataclysm

chron

time

chronometer, synchronize

circum

around

circumspect, circumference

com

with, together, very

commotion, complicate

contra

against, opposing

contradict, contravene

cred

belief, trust

credible, credit

de

from

depart

dem

people

demographics, democracy

dia

through, across, apart

diameter, diagnose

dis

away, off, down, not

dissent, disappear

epi

upon

epilogue

equi

equal, equally

equivalent

ex

out

extract

for

away, off, from

forget, forswear

fore

before, previous

foretell, forefathers

homo

same, equal

homogenized

hyper

excessive, over

hypercritical, hypertension

hypo

under, beneath

hypodermic, hypothesis

in

in, into

intrude, invade

in

not, opposing

incapable, ineligible

inter

among, between

intercede, interrupt

intra

within

intramural, intrastate

magn

large

magnitude, magnify

mal

bad, poorly, not

malfunction

micr

small

microbe, microscope

mis

bad, poorly, not

misspell, misfire

mono

one, single

monogomy, monologue

mor

die, death

mortality, mortuary

neo

new

neolithic, neoconservative

non

not

nonentity, nonsense

ob

against, opposing

objection

omni

all, everywhere

omniscient

ortho

right, straight

orthogonal, orthodox

over

above

overbearing

pan

all, entire

panorama, pandemonium

para

beside, beyond

parallel, paradox

per

through

perceive, permit

peri

around

periscope, perimeter

phil

love, like

philosophy, philanthropic

poly

many

polymorphous, polygamous

post

after, following

postpone, postscript

pre

before, previous

prevent, preclude

prim

first, early

primitive, primary

pro

forward, in place of

propel, pronoun

re

back, backward, again

revoke, recur

retro

back, backward

retrospect, retrograde

semi

half, partly

semicircle, semicolon

sub

under, beneath

subjugate, substitute

super

above, extra

supersede, supernumerary

sym

with, together

sympathy, symphony

trans

across, beyond, over

transact, transport

ultra

beyond, excessively

ultramodern, ultrasonic, ultraviolet

un

not, reverse of

unhappy, unlock

uni

one

uniform, unity

vis

to see

visage, visable