a-, ac-, ad-, af-, ag-, al-, an-, ap-, as-, at-

to, toward, near, in addition to

aside (adverb): to or toward the side

a + side

a-, an-

not, without

apolitical (adjective): without interest in politics

a + polit + ic + al

ab-, abs- 

away from, off

abrupt (adjective): unexpected change

ab + rupt

ante-

before

anterior (adjective): before or near the front

ante + rior

against

antipathy (noun): dislike, opposite feeling

anti + path + y

auto-

self

automotive (adjective): related to self-propelled machines

auto + mot + ive

bi-

two

biped (noun): a two-footed animal

bi + ped

cat-, cata-, cath- 

down, with

category (noun): a class or set to which a thing belongs

cate + gor + y

circum- 

around

circumvent (verb): to manage to get around a situation

circum + vent

co-, cog-, col-, com-, con-, cor

together, with

cohesiveness (noun): the ability to stick together

co + hes + ive + ness

against, opposite

contradict (verb) to state the opposite

contra + dict

to do the opposite, to take away from

decrease (verb): to grow smaller, to become less

de + cre + ase

di-, dif-, dis- 

apart, separate, two, opposite, not

divide (verb): to separate into two or more parts

di + vide

not, opposite of, exclude

distrust (verb): to have no confidence or trust

dis + trust