| BICENTENNIAL | • bicentennial adj. Relating to the 200th anniversary of an event or happening. • bicentennial adj. Occurring every two hundred (200) years. • bicentennial n. The 200th anniversary of an event or happening. |
| BIMILLENNIAL | • bimillennial n. The 2,000th anniversary of an event or happening. • bimillennial adj. Occurring every 2,000 years. • BIMILLENNIAL n. an anniversary recurring every two thousand years. |
| BIMILLENNIUM | • BIMILLENNIUM n. (Latin) a period of two thousand years. |
| CATCHPENNIES | • catchpennies n. Plural of catchpenny. • CATCHPENNY n. a worthless thing made only for profit. |
| CENTENNIALLY | • centennially adv. As part of a centennial. • centennially adv. Once a century, every one hundred years. • CENTENNIAL adv. recurring every hundred years; lasting a hundred years. |
| DUODECENNIAL | • duodecennial adj. Consisting of twelve years, occurring in 12-year cycles. • duodecennial adj. Occurring once a duodecade, occurring every 12 years. • DUODECENNIAL adj. recurring twelve years. |
| MILLENNIALLY | • millennially adv. In millennial terms. • MILLENNIAL adv. of or relating to a millennium. |
| PERENNIALITY | • perenniality n. The state of being perennial. • PERENNIALITY n. the state of being perennial. |
| PINCHPENNIES | • pinchpennies n. Plural of pinchpenny. • pinch␣pennies v. To severely economize. • PINCHPENNY n. a miserly person. |
| QUADRENNIALS | • quadrennials n. Plural of quadrennial. • QUADRENNIAL n. an event taking place every four years. |
| QUADRENNIUMS | • quadrenniums n. Plural of quadrennium. • QUADRENNIUM n. (Latin) a period of four years, also QUADRIENNIUM. |
| QUADRIENNIAL | • quadriennial adj. Alternative form of quadrennial. • quadriennial n. Alternative form of quadrennial. • QUADRIENNIAL adj. taking place every four years. |
| QUADRIENNIUM | • QUADRIENNIUM n. (Latin) a period of four years, also QUADRENNIUM. |
| QUINQUENNIAD | • quinquenniad n. (Now rare) Synonym of quinquennium: A 5-year period. • QUINQUENNIAD n. a period of five years, also QUINQUENNIUM. |
| QUINQUENNIAL | • quinquennial adj. Of or related to a five-year period. • quinquennial n. A five-year period. • quinquennial n. A 5th anniversary. |
| QUINQUENNIUM | • quinquennium n. A period of five years. • QUINQUENNIUM n. a period of five years, also QUINQUENNIAD. |
| SEPTENNIALLY | • septennially adv. Once in every seven years. • SEPTENNIAL adv. lasting or continuing seven years; as, septennial parliaments. |
| SEVENPENNIES | • SEVENPENNY n. a coin worth seven pennies. |
| THREEPENNIES | • threepennies n. Plural of threepenny. • THREEPENNY n. a coin worth three pennies, also THREEPENCE, THRUPPENCE, THRUPPENNY. |
| THRUPPENNIES | • thruppennies n. Plural of thruppenny. • THRUPPENNY n. threepence, as in thruppenny bit, also THREEPENCE, THREEPENNY, THRUPPENCE. |