| A | B |
| ante- | before |
| post- | after |
| antecedent | something that comes before another |
| postscript | note at end(after) a letter |
| ob- | up against OR in the way |
| oc-, of-, op- | means same as "ob-" |
| obnoxious | being annoying/mean against another |
| obstruct | to block view(in the way) of another |
| ambi- | around or both sides |
| amphi- | both sides or around |
| ambidextrous | use both hands equally well |
| amphitheater | oval shaped stadium that goes all the way around stage |
| anti, ant= | against or opposite |
| contro, counter | opposite or against |
| counterfeit | make the opposite of something |
| antiseptic | works against the infection |
| Latin base "mit" or "mis" | send |
| Emissions | gases sent out of tail pipe of car |