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Definition: 1. botany the multiplication of plants, especially in horticulture, either by natural means, eg from seed, or by artificial methods, eg grafting and tissue culture. 2. physics the transmission of energy (eg sound or electromagnetism) from one point to another in the form of waves in a direction perpendicular to the wavefront.
Source: Chambers 21st Century Dictionary. London: Chambers Harrap, 2001. Credo Reference. Web. 03 September 2012.