| QUINQUENNIA | • quinquennia n. Plural of quinquennium. • QUINQUENNIUM n. a period of five years, also QUINQUENNIAD.
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| QUINQUENNIAD | • quinquenniad n. (Now rare) Synonym of quinquennium: A 5-year period. • QUINQUENNIAD n. a period of five years, also QUINQUENNIUM.
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| QUINQUENNIAL | • quinquennial adj. Of or related to a five-year period. • quinquennial n. A five-year period.
 • quinquennial n. A 5th anniversary.
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| QUINQUENNIADS | • quinquenniads n. Plural of quinquenniad. • QUINQUENNIAD n. a period of five years, also QUINQUENNIUM.
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| QUINQUENNIALS | • quinquennials n. Plural of quinquennial. • QUINQUENNIAL n. an anniversary recurring every five years.
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| QUINQUEVALENT | • quinquevalent adj. Alternative spelling of quinquivalent. • QUINQUEVALENT adj. having a valency of five, also QUINQUIVALENT.
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| QUINQUIVALENT | • quinquivalent adj. (Chemistry) Having an atomic valence of 5. • quinquivalent adj. (Medicine) Having a vaccine valence of 5.
 • QUINQUIVALENT adj. having a valency of five, also QUINQUEVALENT.
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| QUINQUAGESIMAL | • quinquagesimal adj. Of or related to a set of 50 people or items. • QUINQUAGESIMAL adj. consisting of fifty days.
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| QUINQUECOSTATE | • quinquecostate adj. (Botany) Having five ribs. • QUINQUECOSTATE adj. five-ribbed.
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| QUINQUEFARIOUS | • quinquefarious adj. (Botany, rare) Arranged in five vertical rows. • QUINQUEFARIOUS adj. arranged in five rows.
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| QUINQUEFOLIATE | • quinquefoliate adj. (Botany) Having five leaves or leaflets. • QUINQUEFOLIATE adj. having five leaves.
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| QUINQUENNIALLY | • quinquennially adv. Every five years. • QUINQUENNIAL adv. lasting five years; occurring every fifth year.
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| QUINQUEPARTITE | • quinquepartite adj. Consisting of five parts. • QUINQUEPARTITE adj. divided into or composed of five parts.
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| QUINQUEVALENCE | • quinquevalence n. The condition of being quinquevalent. • QUINQUEVALENCE n. pentavalency, also QUINQUEVALENCY, QUINQUIVALENCE, QUINQUIVALENCY.
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| QUINQUEVALENCY | • quinquevalency n. Alternative form of quinquivalence. • QUINQUEVALENCY n. pentavalency, also QUINQUEVALENCE, QUINQUIVALENCE, QUINQUIVALENCY.
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| QUINQUIVALENCE | • quinquivalence n. The condition of being quinquivalent. • QUINQUIVALENCE n. the state of being quinquivalent, having a valency of five, also QUINQUEVALENCE, QUINQUEVALENCY, QUINQUIVALENCY.
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| QUINQUIVALENCY | • quinquivalency n. Alternative form of quinquivalence. • QUINQUIVALENCY n. the state of being quinquivalent, having a valency of five, also QUINQUEVALENCE, QUINQUEVALENCY, QUINQUIVALENCE.
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| QUINQUAGENARIAN | • quinquagenarian n. (Obsolete, rare) Synonym of pentecoster: an officer who commands 50 men. • quinquagenarian n. Synonym of fiftysomething: a person between 50 and 59 years old.
 • quinquagenarian adj. (Obsolete, rare) Of or related to command over 50 men.
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| QUINQUEVALENCES | • QUINQUEVALENCE n. pentavalency, also QUINQUEVALENCY, QUINQUIVALENCE, QUINQUIVALENCY. | 
| QUINQUIVALENCES | • QUINQUIVALENCE n. the state of being quinquivalent, having a valency of five, also QUINQUEVALENCE, QUINQUEVALENCY, QUINQUIVALENCY. |