1. Definition: 1. be a social swinger; socialize a lot

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1. Definition: 1. 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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1. Definition: 1. difficulty that causes worry or emotional tension;

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1. Definition: 1. a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree

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1. Definition: 1. a metrical unit with stressed-unstressed syllables

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1. Definition: 1. a metrical unit with unstressed-unstressed syllables

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1. Definition: 1. how much there is or how many there are of something that you can quantify

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