| acoustics |
(used with a sing. verb) the branch of science dealing with the physics of sound. [1/2 definitions] |
| acrobatics |
(used with a sing. verb) the art of performing gymnastic feats. [2/3 definitions] |
| aerobatics |
(used with a sing. or pl. verb) spectacular stunts, such as rolls, loops, and dives, performed by an airplane or glider. |
| aerobics |
(used with a singular or plural verb) a form of exercise that works the heart and lungs to help the body use oxygen better. Running, swimming, biking, or dance are forms of aerobics. |
| aerodynamics |
(used with a sing. verb) a science that deals with the dynamics of air and other gases and with the forces acting on objects that move through them. |
| aeromechanics |
(used with a sing. verb) the science of air or gases in motion or equilibrium. |
| aeronautics |
(used with a singular verb) a science that deals with making and flying aircraft. |
| aerostatics |
(used with a sing. verb) the branch of aeromechanics that deals with gases in equilibrium and with the equilibrium of airborne bodies or aircraft under changing atmospheric conditions. |
| aesthetics |
(used with a sing. verb) a branch of philosophy that deals with formal beauty in art. |
| alga |
singular form of "algae." |
| aloe |
(pl.) a drug derived from the bitter juice of the aloe leaves (used with a sing. verb). [1/2 definitions] |
| am |
first person present sing. of be. |
| amends |
(used with a singular or plural verb) something given or paid to make up for a wrong done to a person or group. |
| analytics |
(used with a sing. verb) the branch of logic that deals with the process of analyzing. |
| apologetics |
(used with a sing. verb) the branch of theology dealing with the defense and proof of a religious faith, esp. Christianity. |
| architectonics |
(used with a sing. verb) the science of designing and constructing buildings. [2 definitions] |
| are1 |
2nd person present sing. and 1st, 2nd, and 3rd person pl. of be. |
| aspect |
in grammar, a category of verb inflections, such as past perfect and past progressive, that indicate whether an action or state is ended or continues, is singular or repeated, and the like. [1/5 definitions] |
| astronautics |
(used with a sing. verb) the science and technology of space travel. |
| astrophysics |
(used with a sing. verb) the branch of physics that deals with the physical and chemical properties of heavenly bodies and interstellar space. |
| athletics |
(usu. used with a sing. verb) the study and practice of athletic development. [1/2 definitions] |