But the doorstep, as she drew near it, acquired a sudden interest from the fact that it was occupied—and indeed filled—by the conspicuous figure of Mr. Rosedale, whose presence seemed to take on an added amplitude from the meanness of his surroundings.
The remaining dresses, though they had lost their freshness, still kept the long unerring lines, the sweep and amplitude of the great artist’s stroke, and as she spread them out on the bed the scenes in which they had been worn rose vividly before her.
There are no more uses of "amplitude" in the book.
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The amplifier to increase the amplitude of sound waves.
Hers is an art of great amplitude and expansive spirit.