| A and M |
abbreviation of "Agricultural and Mechanical." |
| a.m. |
abbreviation of "ante meridiem" (Latin); the period from midnight until noon. |
| D.V.M. |
abbreviation of "Doctor of Veterinary Medicine." |
| M-1 |
the basic .30-caliber U.S. military rifle used in World War II and the Korean War, which is semiautomatic and uses a clip. |
| M-16 |
the basic U.S. military rifle used in the Vietnam War, which is fully automatic and uses small-caliber, high-velocity ammunition. |
| M.A. |
abbreviation of "Master of Arts," a graduate degree, below that of doctor, that is given by a college or university to a person who has completed a prescribed course of graduate study in the humanities or social sciences; master's degree. |
| M.B.A. |
abbreviation of "Master of Business Administration." |
| M.D. |
abbreviation of "medicinae doctor" (Latin); Doctor of Medicine. |
| M.O. |
abbreviation of "modus operandi" (Latin); method of operating. |
| M.P. |
abbreviation of "Member of Parliament," one who has been elected to the parliament of a nation. |
| M.S. |
abbreviation of "Master of Science," a master's degree awarded usu. in science, technology, or mathematics. |
| NM |
abbreviation of "New Mexico," a southwestern U.S. state between Texas and Arizona. |
| P.M. |
abbreviation of "Prime Minister," the chief minister and head of the cabinet in parliamentary governments. |
| p.m. |
abbreviation of "post meridiem" (Latin); after noon, or the period of time from noon until midnight. |
| Richard M. Nixon |
the 37th President of the United States (1969-1974), who supported but eventually discontinued U.S. involvement in the Vietnam War. President Nixon is credited with improving U.S. relations with China by making an historic trip to that country in 1972. Nixon is the only U.S. President to resign while in office (b.1913--d.1994). |