| Front | period |ˈpɪərɪəd| |
|---|---|
| Back | noun 1 a length or portion of time: 2 Physics the interval of time between successive occurrences of the same state in an oscillatory or cyclic phenomenon, such as a mechanical vibration, an alternating current, a variable star, or an electromagnetic wave. 3 a flow of blood and other material from the lining of the uterus, lasting for a few days and occurring in sexually mature women who are not pregnant at intervals of about one lunar month until the menopause. 4 N. Amer. a full stop. 5 Chemistry a set of elements occupying a horizontal row in the periodic table. 6 Rhetoric a complex sentence, especially one consisting of several clauses, constructed as part of a formal speech or oration. adjective belonging to or characteristic of a past historical time, especially in style or design: |
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