| 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." |
| algae |
organisms that live mainly in the water and make their food through photosynthesis. Algae are different from plants in that they have no true leaves, roots, or stems. Seaweeds are algae. "Algae" is a plural noun; the singular form is "alga." |
| 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. |