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From The Collaborative International Dictionary of English v.0.48:
Vanishing \Van"ish*ing\, a. & n. from Vanish, v. [1913 Webster] Vanishing fraction (Math.), a fraction which reduces to the form 0/0 for a particular value of the variable which enters it, usually in consequence of the existence of a common factor in both terms of the fraction, which factor becomes 0 for this particular value of the variable. --Math. Dict. Vanishing line (Persp.), the intersection of the parallel of any original plane and the picture; one of the lines converging to the vanishing point. Vanishing point (Persp.), the point to which all parallel lines in the same plane tend in the representation. --Gwilt. Vanishing stress (Phon.), stress of voice upon the closing portion of a syllable. --Rush. [1913 Webster]