Englishfor English speakers
propagation
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noun
the spreading of something (a belief or practice) into new regions
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noun
(= generation)
the act of producing offspring or multiplying by such production
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noun
the movement of a wave through a medium
vector
Noun
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A vector is a quantity with both a size and a direction.
In teaching physics, force or velocity vectors can be added to the animation.
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A vector is an animal or insect that carries and spreads a disease.
Other forms of this disease used different insect vectors.