Definition of “focus”
noun:
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A point at which reflected or refracted rays of light converge.
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A point of a conic at which rays reflected from a curve or surface converge.
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The fact of the convergence of light on the photographic medium.
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The quality of the convergence of light on the photographic medium.
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Concentration of attention.
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The exact point of where an earthquake occurs, in three dimensions.
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The indicator of the currently active element in a user interface.
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The most important word or phrase in a sentence or passage, or the one that imparts information.
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verb:
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To cause (rays of light, etc) to converge at a single point.
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To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.
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To concentrate one's attention.
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To make (a liquid) less diluted.
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To concentrate one's attention.
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