| 22nd Amendment |
an amendment to the U.S. Constitution that ensures that no person can be elected to more than two four-year terms as President of the United States. The 22nd Amendment, ratified in 1951, was passed in reaction to President Franklin D. Roosevelt's four terms in office. |
| 4WD |
abbreviation of "four-wheel drive," a car that drives by means of all four wheels rather than the rear wheels only, or the drive system of such, in which both front and rear wheel axles are turned by the drive shaft. |
| a1 |
one of the four human blood types. (See ABO system.) [1/6 definitions] |
| AB1 |
one of the four human blood groups. (See ABO system.) |
| advent |
(cap.) the coming of Jesus Christ, or the period including four Sundays before Christmas. [1/2 definitions] |
| airman |
in the U.S. Air Force, an enlisted person of one of the four lowest ranks. [1/3 definitions] |
| Alice Marble |
U.S. tennis player who won the U.S. tennis championship singles titles four times (1936, 1938-40) prior to working as a spy for U.S. intelligence (b.1913--d.1990). |
| alyssum |
any of a group of weedy low-growing plants of the mustard family, having tiny white or yellow four-petaled flowers borne on branched stalks. [1/2 definitions] |
| arachnid |
an arthropod having four pairs of legs and belonging to the class that includes scorpions, ticks, and spiders. |
| around the clock |
through all twenty-four hours; without stopping; tirelessly. |
| Atlantic Standard Time |
the standard time used in the western Atlantic and the easternmost parts of Canada, four hours behind Greenwich time. |
| ATV |
abbreviation of "all-terrain vehicle," a small motor vehicle, usu. with three or four wheels, that is designed for use on various types of terrain. |
| automobile |
a four-wheeled vehicle with a built-in, self-propelled motor requiring a driver and used on roads to carry people; passenger car. |
| b |
one of the four human blood types. (See ABO system.) [1/5 definitions] |
| B-17 |
a four-engine U.S. bomber extensively used in World War II; Flying Fortress. |
| baby carriage |
a small, four-wheeled carriage used to push a baby around in; perambulator. |
| baccalaureate |
the degree awarded to most graduates of four-year colleges in the United States; bachelor's degree. [1/2 definitions] |
| bachelor |
a person who has earned a four-year college degree. [1/2 definitions] |
| backbeat |
a primary accent on the second and fourth beats of a four-beat measure, common in popular music; secondary beat. |
| balance beam |
a long wooden horizontal beam raised about four feet above the floor, on which women gymnasts perform various balancing routines. [1/2 definitions] |
| ballade |
a poem of three eight-line or ten-line stanzas followed by an envoy of four or five lines, the stanzas and the envoy all having the same last line. [1/2 definitions] |