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articulated lorry a British word for a very large truck that consists of a cab where the driver sits and a trailer that carries goods over long distances. "Articulated lorry" often has the same meaning as "tractor-trailer."
artifact any object made by human beings, especially one of an earlier era.
artificial made by human beings; not natural. [2 definitions]
artificial intelligence an area of computer science that explores the ability of computers to think or have intelligence. Artificial intelligence is concerned with developing computer programs or computers that seem to use reason and make decisions.
artificial respiration the forcing of air into and out of the lungs of a person who has stopped breathing.
artillery large weapons used in land battles, such as cannons or rockets. Artillery is too heavy for a person to carry and is sometimes mounted on wheels. [2 definitions]
artisan a person skilled in making things, especially by using the hands. People such as those who make furniture, quilts, or other crafts are artisans.
artist a person who is good at painting, music, writing, or any other art. [2 definitions]
artistic having to do with art or artists. [2 definitions]
art room a room in a school where art is taught and where art materials are kept.
As symbol of the chemical element arsenic.
as1 in equal measure; to the same extent. [7 definitions]
ASAP abbreviation of "as soon as possible."
asbestos a mineral that separates into fibers and does not catch fire or conduct electricity. Asbestos is used to make fireproof materials and insulation.
ascend to go upward; climb; rise. [2 definitions]
ascent the act of going up; climb; rise. [2 definitions]
ascertain to learn without question; determine.
ash1 the soft gray powder that is left after something has been burned.
ash2 a tree that is related to the olive tree. It has seeds that look like wings and leaves of more than one part. [2 definitions]
ashamed feeling shame or guilt for doing something wrong or foolish. [3 definitions]
ashore to or onto the shore. [2 definitions]