| 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 sing. or pl. verb) a system of physical conditioning involving sustained and vigorous exercise such as running, swimming, cycling, or dancing, that stimulates the heart and lungs and thereby improves the body's ability to utilize oxygen. |
| 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 sing. verb) a science that deals with the design, operation, and navigation of 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. |
| 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 sing. or pl. verb) payment or compensation given to repair or satisfy damage, injury, or loss. |
| 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] |
| atmospherics |
(used with a sing. verb) static in radio reception caused by atmospheric electrical activity. [1/2 definitions] |