| ahoy |
a word used as a greeting to attract the attention of sailors on a ship. |
| aid |
to give help to or assist. [3 definitions] |
| aide |
any assistant or person who gives support. |
| AIDS |
a serious disease caused by a virus that stops the body from being able to protect itself from other diseases. "AIDS" stands for "acquired immune deficiency syndrome." |
| ail |
to trouble or cause pain to. [2 definitions] |
| ailment |
a sickness or disorder; illness. |
| aim |
to point carefully with the hope of hitting something or someone. [6 definitions] |
| aimless |
having no purpose or goal. |
| ain't |
(informal) a contraction of "am not," "is not," "are not," "have not," or "has not." |
| air |
the mixture of gases that surrounds the earth. Air is made up of oxygen, nitrogen, and other gases, and has no taste, odor, or color. [6 definitions] |
| air bag |
a bag in the front of some cars that blows up with air instantly in a crash to stop the passengers from being thrown forward. |
| air conditioner |
a machine that cools the air in a room or car. An air conditioner also takes the dust and dampness out of the air. |
| air conditioning |
a system that cools air and takes dust and dampness out of it. Air conditioning is used inside buildings and cars. |
| aircraft |
any machine that can fly through the air, such as an airplane, helicopter, glider, or balloon. |
| aircraft carrier |
a very large ship with a flat deck on which airplanes can take off and land. |
| air force |
the branch of a nation's armed forces that trains and fights using aircraft. |
| airline |
a system of transportation that allows people to fly from one place to another, or a business that owns and operates the equipment to do this. |
| airliner |
a large airplane used to fly people from one place to another. |
| airmail |
of or having to do with mail sent by air. [5 definitions] |
| airplane |
a machine that can fly because of the force of air upon its wings; plane. An airplane is driven by propellers or a jet engine. |
| airport |
a large area of level land where airplanes can land and take off. |