1. A the 1st letter of the Roman alphabet
  2. 1st Earl Baldwin of Bewdley English statesman; member of the Conservative Party
  3. 1st Viscount Montgomery of Alamein English general during World War II
  4. ABO blood group system a classification system for the antigens of human blood
  5. 3rd October Organization a militant Marxist-Leninist terrorist organization formed in 1975 to force Turkey to acknowledge killing more than a million Armenians and forcibly removing them from border areas in 1915; wants Turkey to pay reparations and cede territory to Armenia
  6. ASCII control character ASCII characters to indicate carriage return or tab or backspace; typed by depressing a key and the control key at the same time
  7. Abbott Lawrence Lowell United States educator and president of Harvard University
  8. A. E. W. Mason English writer (1865-1948)
  9. 1st Baron Beaverbrook British newspaper publisher and politician
  10. Aaron Montgomery Ward United States businessman who in 1872 established a successful mail-order business (1843-1913)
  11. 5-hydroxy-3-methylglutaryl-coenzyme A reductase a liver enzyme that is responsible for producing cholesterol
  12. Abel Janszoon Tasman Dutch navigator who was the first European to discover Tasmania and New Zealand (1603-1659)
  13. ASCII character set 128 characters that make up the ASCII coding scheme
  14. 15 May Organization a terrorist organization formed in 1979 by a faction of the Popular Front for the Liberation of Palestine but disbanded in the 1980s when key members left to join a faction of al-Fatah
  15. 1st Earl of Balfour English statesman; member of the Conservative Party
  16. ABA transit number an identification number consisting of a two-part code assigned to banks and savings associations; the first part shows the location and the second identifies the bank itself
  17. 1st Baron Verulam English statesman and philosopher
  18. 1st Earl Attlee British statesman and leader of the Labour Party who instituted the welfare state in Britain (1883-1967)
  19. A. A. Michelson United States physicist (born in Germany) who collaborated with Morley in the Michelson-Morley experiment (1852-1931)
  20. A. Noam Chomsky United States linguist whose theory of generative grammar redefined the field of linguistics (born 1928)