SAT English prefixes, roots

a- , an-

not, without, lack of

ab-

away from

ad-

toward

ambi-

both

ante-

before

anti-

against, opposite, to prevent/counteract

auto-

self

bene-

good, well

bi-

two

circum-

around, surrounding

co-, com-, con-

with, together

contra-

against, opposite, in opposition

de-

down, off, away from, remove

dis-

apart, not, opposite (negate)

en-, em-

put into, cause to be

ex-, e

out of, away from

extra-

beyond, on the outside

hyper-

over, excessive

hypo-

under, below normal

il-, im-, in-, ir-

not, opposite of

inter-

between, among (indicates relationships or interactions between entities)

intra-

within, inside (describe things inside a particular structure or entity)

mal-

bad, wrong

mid-

in the middle of

mis-

wrong/wrongly, bad/badly

mono-

one, single

multi-

many, more than one

non-

not, negation, lack, or absence

ob-

against, toward in the direction of

omni-

all, everywhere

over-

too much, above, beyond a normal limit

post-

after, following

pre-

before, in advance of

pro-

(moving) forward, in favor of

re-

again, back (repitition)

retro-

backward, behind, relating to an earlier time

semi-

half, partial, somewhat

sub-

under, beneath, below, secondary

super-

above, over, beyond, exaggerated

syn-, sym-

together

trans-

across, beyond, through (movement, change, crossing from one condition to another)

tri-

three

un-

not, opposite of, reversal or removal of an action, negate

under-

below, beneath, insufficiently, to little

uni-

one, single