| A | B |
| a;an | no;not;without |
| anesthesia | Loss of sensation |
| anarchy | Political disorder and confusion |
| achromatic | designating color perceived to have zero saturation, like gray, black, or white |
| agnostic | One who believes that there can be no proof of the existence of God, but does not deny he exists |
| anomaly | an unusual person |
| anodyne | capable of soothing or eliminating pain |
| anonymous | having an unknown name |
| anosmia | loss of the sense of smell |
| anosmic | having an impaired sense of smell |
| apathy | lack of emotion or interest |
| aphonia | loss of the vioce |
| aphonic | being voiceless through injury or illness |
| atom | the smallest component of an element having the chemical properties |
| atheism | someone who doesn't believe in God |
| atrophy | a decrease in size of an organ |
| anachronism | Something as happening in other than the proper or historical order |