| A | B |
| ambi, amphi | both, around |
| ambiance | environment or atmosphere |
| ambidextrous | able to use both hands equally well |
| ambiguous | having two or more possible meanings |
| ambivalent | having opposite and conflicting feelings about something; unsure |
| amphibian | an animal with a backbone that is able to live on land and water |
| amphitheater | open space surrounded by rising rows of seats such as a sports arena |
| ben, bene | good, well |
| benediction | a blessing |
| benefactor | a person who gives help or support; especially financial aid |
| beneficiary | a person who receives a benefit or advantage, such as an inheritance |
| benevolent | doing good things; being good-hearted |
| volens | Latin "wishing" |
| benign | gentle and kind; not life-threatening |
| circ, circum | around, circle |
| circa | about or approximately |
| circuitous | roundabout; indirect, devious |
| circulation | the act of moving in a circle |
| circumference | the outer line of a circle |
| circumnavigate | to sail around something; especially the world |
| circumscribe | to draw or form a line around; especially a circle |
| circumspect | careful to consider all related circumstances before acting |
| circumvent | to avoid or find a way around |
| com | together, with |
| combat | to fight with, to struggle, a battle |
| commiserate | to express sorrow or pity |
| companion | a person who accomanies |
| beneficial | having a good or helpful effect |
| compare | to note the similarities or difference of |
| compete | to try to outdo or defeat someone else |
| compose | to form by putting together |
| compound | something made of several parts |
| compress | to squeeze together, to reduce in size |
| con | together, with |
| conform | to act in agreement with rules, customs, standards |
| congregate | to come together in a group; to assemble |
| conjunction | the state of being joined; combination |
| connect | to join |
| consent | to agree or give persmission |
| construct | to make or put together by assembling parts |
| contend | to fight; to compete; to argue |
| convenient | suited to one's comfort, needs, or purpose |
| cred | to believe |
| accredit | to give credit for |
| credo | a set of beliefs |
| credulous | inclined to believe anything |
| discredit | to reject as untrue |
| incredible | unbelievable |
| de | away, down |
| debase | to lower in quality, rank or dignity |
| decline | a downward slope; to refuse politely |
| deduct | to subtract or take away |
| deflate | to release air or gas from a container |
| deposit | to put or lay down |
| descend | to go down |
| desultory | moving or jumping from one thing to another |
| detrimental | damaging or harmful |
| dis | not, without |
| disadvantage | an unfavorable condition or circumstance |
| disequalibrium | loss or lack of balance |
| dishonor | loss of respect or reputation |
| disparity | a lack of equality |
| disrespectful | impolite, rude |
| dissatisfied | not pleased; not content |
| dissimilar | unlike or different |
| ex | out, out of |
| excavate | to make a hole in |
| excerpt | a passage taken from a book, article |
| exorbitant | too great, too extreme |
| exotic | foreign or introduced from another country |
| expel | to force or drive out |
| extinguish | to put out; to bring to an end |
| extrude | to force or push out |
| exude | to ooze; to discharge gradually |
| hydr, hydro | water |
| dehydrate | to lose or remove water |
| hydrant | a large, upright pipe connected to a water main |
| hydraulics | being operated by or using a liquid |
| hydrocarbon | organic compounds containing carbon and hydrogen |
| hydroelectric | relating to electricity produced from flowing water |
| hydrophobia | an abnormal fear of water; rabies |
| hydroplane | a light, fast boat designed to skim the surface of water |
| ject | to throw |
| abject | comptemptible, humble, wretched |
| conjecture | a guess or judgement |
| dejected | sad and depressed |
| eject | to force out or cause to be removed |
| interject | to break in with a comment while someone else is speaking |
| projectile | any object fired from a gun by means of an explosive charge |
| rejection | a refusal to accept or use |
| trajectory | the path, especially a curve, traced by a moving object |
| credence | acceptance or belief |
| credential | letter or document that affirms a person's right to hold a position |