|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|1.||a portion of time of indefinable length: he spent a period away from home|
|2.||a. a portion of time specified in some way: the Arthurian period; Picasso's blue period|
|b. (as modifier): period costume|
|3.||a nontechnical name for an occurrence of menstruation|
|4.||geology a unit of geological time during which a system of rocks is formed: the Jurassic period|
|5.||a division of time, esp of the academic day|
|a. T the time taken to complete one cycle of a regularly recurring phenomenon; the reciprocal of frequency|
|b. an interval in which the values of a periodic function follow a certain pattern that is duplicated over successive intervals: sin x = sin |
|a. the time required by a body to make one complete rotation on its axis|
|b. the time interval between two successive maxima or minima of light variation of a variable star|
|8.||chem Compare group one of the horizontal rows of elements in the periodic table. Each period starts with an alkali metal and ends with a rare gas|
|9.||Also called: full stop the punctuation mark (.) used at the end of a sentence that is not a question or exclamation, after abbreviations, etc|
|10.||a complete sentence, esp a complex one with several clauses|
|11.||music Also called: sentence a passage or division of a piece of music, usually consisting of two or more contrasting or complementary musical phrases and ending on a cadence|
|12.||(in classical prosody) a unit consisting of two or more cola|
|13.||rare a completion or end|
|[C14 peryod, from Latin periodus, from Greek periodos circuit, from |
period pe·ri·od (pĭr'ē-əd)
An interval of time characterized by the occurrence of a certain condition, event, or phenomenon.
One of the stages of a disease.
A menstrual period.
A sequence of elements arranged in order of increasing atomic number.
periodic pe·ri·od·ic (pĭr'ē-ŏd'ĭk)
Having or marked by repeated cycles.
Recurring at regular intervals.
|period (pĭr'ē-əd) Pronunciation Key