| A | B |
| brace | two of a kind, pair, couple |
| centenarian | one who is older than 100 |
| centennial | 100th anniversary |
| decade | period of 10 years |
| decathalon | track and field contest consisting of 10 events |
| decimate | destory ten percent or more or a large portion of |
| dichotomy | division in two, split |
| fathom | measure of water depth equaling six feet |
| fortnight | period of fourteen days, two weeks |
| millenium | 1000 years; 1000th anniversary |
| nonagenarian | person in his or her 90s |
| octogenarian | person in his or her 80s |
| pentagon | plane figure of five sides and five angles |
| plurality | victor's margin over the runner-up when no candidates has a majority of the votes |
| quadrennial | occuring or being done every for years |
| quadruped | four-footed animal |
| score | group of twenty |
| septuagenarian | person in his or her 70s |
| sesquicentennial | 150th anniversary |
| tercentennial | 300th anniversary |
| tithe | one tenth |
| treble | multiple by three, triple |
| triumvirate | ruling body of three, troika |
| acrophobia | abnormal fear of being in high places |
| agoraphobia | abnormal fear of being in crowds, public places, or open areas |
| audiophile | one especially interested in high-fidelity sound reproduction |
| balletomania | extreme enthusiasm for the ballet |
| bibliophile | person who loves or collects books |
| bibliophobe | person with bibliophobia |
| claustrophobia | dread of being in closed or narrow spaces |
| dipsomaniac | person with an uncontrollable craving for alcoholic beverages |
| hemophiliac | person afflicted with hemophilia, a tendency to blled |
| kleptomaniac | one who has a persistent neurotic impulse to steal |
| mania | exaggerated enthusiasm,craze, mad implulse |
| megalomania | mental disorder characterized by fantasies of grandeur |
| monomania | derangement of the mind on one subject only |
| phobia | abnormal and persistent fear, dislike or hatred |
| photophillic | light living; requiring abundant light |
| photophobia | painful sensitivity to light |
| photophobic | shunning light, light-hating |
| pyromaniac | person having an insane impulse to start fires |
| xenophobia | unreasonable fear or hatred of foreigners or strangers |
| monograph | learned treatise on a particular subject, scholarly article |
| monologue | lenthy talk by one person |
| monorail | railway whose cars are supported on or under a single rail |
| monosyllabic | having one syllable |
| monotonous | tiresome because of lack of variety |
| multicultural | reflecting many different cultures |
| multifaceted | having many facets or aspects |
| multilateral | having many sides, participated in by more than two participants |
| multimedia | involving a combination of media such as TV, radio, and newspapers |
| multinational | having subsidiaries or operations in several countries |
| polygamist | person married to two or more mates at the same time |
| polyglot | person who speaks or writes several languages |
| polymath | person of great and diversified learning |
| polytechnic | providing instruction in many technical arts and applied sciences |
| polytheistic | believing in more than one god |
| unanimous | being of one and the same opinion, showing complete agreement |
| unicameral | consisting of or having one legislative chamber |
| uniform | always the same, not varying in form, degree or manner |
| unique | being the only one of its kind |
| unisex | not distinguishable as male or female, designed for both sexes |