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about-face a reversal of one's position or direction, esp. in response to a military command. [3 definitions]
about to ready to; shortly going to.
above at or to a higher place than. [9 definitions]
aboveboard without tricks, deceit, or concealment.
ab ovo from the egg (Latin); from the beginning.
abracadabra a nonsense word thought to produce a magical effect such as the warding off of disaster or disease. [2 definitions]
abradant am abrasive substance. [2 definitions]
abrade to rub away by friction; erode. [4 definitions]
Abraham according to the Old Testament, the first of the postdiluvian patriarchs, father of Isaac, and ancestor of the Hebrews.
Abraham Lincoln the 16th President of the United States (1861-1865), who was Commander-in-Chief of the Union troops during the American Civil War and who signed the Emancipation Proclamation, thus bringing an end to slavery in the United States (b.1809--d.1865).
abranchiate lacking gills.
abrasion a spot or patch that has been scraped, as on the skin. [2 definitions]
abrasive a material or substance used to grind or polish surfaces. [3 definitions]
abreast side by side. [4 definitions]
abridge to shorten without removing basic contents; condense. [2 definitions]
abridgment an act, process, or instance of abridging. [3 definitions]
abroad in or to a country that is not one's own. [4 definitions]
abrogate to abolish, repeal, or nullify by authority. [2 definitions]
abrupt sudden and unexpected. [3 definitions]
abs- from; away; off.
Abscam in the United States, an FBI investigation in 1978-80, as a result of which several members of Congress were indicted for taking bribes from FBI agents posing as Arab businessmen.