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Natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle)
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Recurring at regular intervals
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The arrangement of spoken words alternating stressed and unstressed elements
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The basic rhythmic unit in a piece of music
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An interval during which a recurring sequence of events occurs
SynonymDefinitionAntonym.com - English Synonym Dictionary
