Vocabulary Prefixes

a-, an-
without, not

amorphous

ab-, abs
away, from, apart

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absent

ad-, ac-, af-
to, toward

advent, advance

aero-
air

aeroplane, aeronaut

amb-, ambi-
both, around

ambiguous

amphi-
both, around

amphitheater

ante-
before

antenatal

anti-
against

antidote, antitoxic

apo-
away from

apostasy

arch-
chief, most important

archbishop, archcriminal

auto-
self

automatic, autocrat

be-
about, make

belittle, beguile, beset

bene-
well, good

benediction

bi-
two

biennial, bicycle

by-, bye-
added to

byways, by-laws

cata-
down

catalogue, cataract

centi-, cente-
hundred

centigrade, centenary

circum-
around

circumference, circumambient

co-, col-, com-, cor-
together

companion

contra-
against, counter

contradict, contraceptive

de-
down

denude, decentralize

deca-, deci
ten

decade, decagon

demi-
half

demigod

dia-
through, between

diameter

dis-
not, opposite to

dislike, disagree

duo-
two

duologue, duplex

dys-
ill, hard

dysentary

e-, ex-
out of

exhale, excavate

ec-
out of

eccentric

en-, in-, em-, im-
into, not

enrage, inability, embolden, emulate, impress

equi-
equally

equidistant

epi-
upon, at, in addition

epidemic, epidermis

extra-
outside, beyond

extra-essential

for-, fore-
before

foresee

hemi-
half

hemisphere

hepta-
seven

heptagon

hexa-
six

hexagon, hexateush

homo-
same

homonym

homo-
same

homonym

hyper-
above, excessive

hypercritical, hypertrophy

il-
not

illegal, illogical

in-, im-, un-
not

imperfect, inaccessible

inter-
among, between

interrupt, intermarriage

intra-, intro-
among, between

intramural, introvert

iso-
equal, same

isobaric, isosceles

mal-
bad, wrong

malfunction, malformed

meta-
after, beyond

metabolism, metaphysical

mis-
wrongly

mifit, mislead

mono-
one, single

mototonous, monocular

multi-
many

multipurpose, multimillion

non-
not

nonsense, nonpareil

ob-, oc-, of-, op-
in the way of, resistance

obstruct, obstacle, oppose

octa-, octo-
eight

octahedron, octave

off-
away, apart

offset

out-
beyond

outnumber, outstanding

over-
above

overhear, overcharge

para-
aside, beyond

parable, paradox

penta-
five

pentagon, pentateuch

per-
through

perennial, peradventure

peri-
around, about

perimeter, pericardium

poly-
many

polygamy, polytechnic

post-
after

postscript, postnatal

pre-
before

prehistoric, prewar

prime-, primo-
first, important

primary, prime minister

pro-
in front of, favoring

prologue, pro-British

quandri-
four

quandrennial, quadrangle

re-
again, back

reappear, recivilize

retro-
backward

retrograde, retrospect

se-
aside

secede

self-
personalizing

self-control, self-taught

semi-
half

semicircle, semidetached

sub-
under

submarine, subterranean

super-
above, over

superfluous, superior

syl-
with, together

syllogism

syn-, sym-
together

sympathy, synchronize

tele-
far, at or to a distance

telegram, telepathy

ter-
three times

tercentenary

tetra-
four

tetrahedron, tetralogy

trans-
across, through

transatlantic, translate

tri-
three

triangle, triparite

ultra-
beyond

ultramarine, ultraviolet

un- (im)
not

unbroken, unbutton, unable

under-
below

underfed, underling

uni-
one

unicellular, uniform

vice-
in place of

viceroy, vice-president

yester-
preceding time

yesterday, yesteryear