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22nd Amendment |
an amendment to the U.S. Constitution that ensures that no person can be elected to more than two four-year terms as President of the United States. The 22nd Amendment, ratified in 1951, was passed in reaction to President Franklin D. Roosevelt's four terms in office. |
absolute temperature |
temperature measured on a scale in which zero equals the lowest temperature that can be obtained physically. |
account |
an arrangement wherein a bank or other financial institution holds a customer's deposited funds so that the funds are safe but can be accessed at any time by the customer, or the conception of this arrangement as a container for the funds that are kept. [1/16 definitions] |
actinic rays |
electromagnetic radiation, such as x-rays or ultraviolet light, that can produce an image on a photographic emulsion. |
activation code |
a set of characters, consisting of numbers, letters, characters, or a combination of these, that is sent by a website to a user's email so that the website can verify the user's email address and comply with the user's request to begin a new service or change personal information. Once received, the user enters the code into the provided box on the website so that fulfillment of the user's request can begin. |
addition table |
a table that can be used to find the sum of two numbers. |
adenoid |
(usu. pl.) a mass of tissue between the nose and the throat that, when swollen, can hinder breathing. [1/2 definitions] |
aflatoxin |
any of a group of toxic compounds produced by certain molds, esp. those in the genus Aspergillus. Consumption of food contaminated with these molds can cause liver disease and cancer. |
agitator |
a machine, or part of a machine, that automatically shakes or stirs things together, as in a can of paint or a washing machine. [1/2 definitions] |
aircraft |
any man-made vehicle that can fly through the air, such as an airplane, helicopter, glider, or balloon. |
aircraft carrier |
a very large warship with a flat upper deck on which airplanes can take off and land. |
air lock |
an airtight compartment in which the air pressure can be regulated, usu. situated between two areas that have different air pressures, as in underwater operations. [1/2 definitions] |
air pocket |
a downward air current that can cause an abrupt change, usu. a drop, in an aircraft's altitude. |
airport |
a large area of level land where airplanes can land and take off, usu. including a passenger terminal and cargo and repair facilities. |
air shaft |
a narrow vertical passage through which fresh air can reach an otherwise enclosed area such as the interior of a building; ventilating shaft. |
Aladdin |
in The Arabian Nights, a boy who finds a magic lamp and ring, each of which enables him to bring forth a powerful genie who can grant his every wish. |
alarm clock |
a clock with a bell or buzzer that can be set to sound at a chosen time. |
album |
a book or binder with blank pages or empty pockets in which a collection can be inserted, as of photographs, stamps, or mementos. [1/3 definitions] |
alkali metal |
any of a group of highly reactive chemical elements, such as sodium and potassium, that are typically univalent cations forming various compounds, but that can be isolated as soft, low-density metals. |
ambient |
a type of instrumental music characterized by patterns of sound rather than melodic form or rhythmic structure, and which can be explicitly listened to or serve as background or atmospheric sound. [1/3 definitions] |
anaconda |
any of several large nonvenomous constrictor snakes, esp. a certain South American tree snake that can grow to over twenty feet in length. |
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