1. Definition: 1. the adjustment of a radio receiver or other circuit to a required frequency

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1. Definition: 1. (music) two or more sounds or tones at the same pitch or in octaves; "singing in unison"

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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. a long and complex sonata for symphony orchestra

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1. Definition: 1. (physics) the property of being isotropic; having the same value when measured in different directions

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1. Definition: 1. harmonious arrangement or relation of parts or elements within a whole (as in a design); "in all perfectly beautiful objects there is found the opposition of one part to another and a reciprocal balance"- John Ruskin

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