noun

*pl.*ABC's

- the alphabet
- the basic or simplest elements (of a subject); rudiments

noun

- the alphabet
- the basic or simplest elements (of a subject); rudiments

- American Bowling Congress
- service mark for American Broadcasting Company

Webster's New World College Dictionary, Fifth Edition Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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noun

often- The alphabet:
*learned her ABCs when she was three years old.* - The rudiments of reading and writing.
- The rudiments of a subject:
*taught the ABCs of geometry.*

THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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Noun

(*plural* ABCs)

- (US, usually plural only, uncountable) The alphabet. [First attested from around (1150 to 1350).]
^{ }*Do you know your ABCs?*

- The fundamentals of any subject. [First attested in the mid 16
^{th}century.]^{ }*the ABC of finance*

- (UK, rail transport) A British alphabetized guidebook for trains and their stations.

Origin

The first three letters of the Latin alphabet, standing for the whole alphabet

English Wiktionary. Available under CC-BY-SA license.

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(**A**tanasoff-**B**erry **C**omputer) The first electronic digital computer. Completed in 1942 by Iowa State Professor John Atanasoff and graduate student Clifford Berry, it employed many of the principles of future computers. For example, although physically in the form of rotating drums, its memory used capacitors that were constantly being recharged like today's dynamic RAM (see DRAM).
The ABC used a standard IBM card reader for input and an odometer-like device for output. For interim storage, Atanasoff devised a binary punch and reader that could very quickly store 1,500 bits on paper sheets by electrostatically burning holes in them. The ABC could solve 29 linear equations with 29 unknowns in one 24-hour day, a marvel for its time.
**It Took Years for Recognition**
John Mauchly, cobuilder of the ENIAC, began corresponding with Atanasoff in 1940 and visited him in 1941. Although Eckert and Mauchly's machine gained international attention, Atanasoff was not recognized until years later. A 1973 court overturned an ENIAC patent, stating that the basic ideas of the modern computer came from Atanasoff. Some 17 years later at the age of 87, he was finally honored by receiving the National Medal of Technology.
In 1994, an Iowa State University team started building a replica of the ABC. It took three years to complete, but worked exactly as it was supposed to.

Computer Desktop Encyclopedia THIS DEFINITION IS FOR PERSONAL USE ONLY All other reproduction is strictly prohibited without permission from the publisher. © 1981-2017 The Computer Language Company Inc. All rights reserved.

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- Hence in trilinear co-ordinates, with
**ABC**as fundamental triangle, its equation is Pa+Q/1+R7=o. - If four fluids, a, b, c, d, meet in a point 0, and if a tetrahedron AB CD is formed so that its edge AB represents the tension of the surface of contact of the liquids a and b, BC that of b and c, and so on; then if we place this tetrahedron so that the face
**ABC**is normal to the tangent at 0 to the line of concourse of the fluids**abc**, and turn it so that the edge AB is normal to the tangent plane at 0 to the surface of contact of the fluids a and b, then the other three faces of the tetrahedron will be normal to the tangents at 0 to the other three lines of concourse of the liquids, an the other five edges of the tetrahedron will be normal to the tangent planes at 0 to the other five surfaces of contact. - Let us imagine unit mass of solution of volume V confined in a cylinder
**ABC**between a fixed vapour sieve B and a solid piston A A B C FIG. - 7,
**ABC**is any triangle 1 Eisenlohr, Ein math. - = constant, _ ff 00 NdA N BA-AA X - JA (a' +X) (b 2 +A)P -
**abc**' a2 -b2 ' and at the surface A = o, I I N Bo-A 0 N I R - (a2+b2)**abc**a 2 -b 2**abc**a2b2 I /b 2 N = R I /b2 - I /a2**abc**I 1 I Bo - AO' a 2 b 2 - a2 b2 a 2 b2 = R (a 2 - b 2) /(a 22 + /b2) 2 - r (B o - Ao) U Bo+Co - B I - CI' Since - Ux is the velocity function for the liquid W' filling the ellipsoid A = o, and moving bodily with it, the effective inertia of the liquid in the interspace is Ao+B1+C1 Bo+Co - B1 - C, If the ellipsoid is of revolution, with b=c, - 2 XBo - - C BI' and the Stokes' current function 4, can be written down (I) is (5) (7) (6) The velocity function of the liquid inside the ellipsoid A=o due to the same angular velocity will be = Rxy (a2 - b2)/(a2 + b2), (7) and on the surface outside _ N Bo -Ao c1)0xy**abc**2 62' so that the ratio of the exterior and interior value of at the surface is ?o= Bo-Ao (9) 4)1 (a 2 -6 2)/(a2 + b) - (Bo - Ao)' and this is the ratio of the effective angular inertia of the liquid, outside and inside the ellipsoid X = o.

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