One of the mysteries of the English language finally explained.
The quantitative relationship between two amounts, especially when expressed as a ratio specifying the number of times that one contains or is contained in the other.
Late 18th century. From post-classical Latin quantuplicitas, irregularly from quantuplus (1693; from classical Latin quantus how much + -plus (in e.g. duplus)) + -icitas, after duplicitas duplicity, etc.; apparently translating Hellenistic Greek πηλικότης magnitude, size (in plural, πηλικότητες, in Euclid Elements 6, def. 5).
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