I'll take a stab at it:
The science of manipulating numerical values by combining or comparing different numbers to produce a simple resulting value
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dictionary.reference.com had this to say:"a grade or level of subsistence and comfort in everyday life enjoyed by a community, class, or individual: The well-educated generally have a high standard of living. "
mathematics
"Usion" does not appear to be a standard English word. It is possible that it may be a typographical error or a misspelling of another word. Without further context or information, it is difficult to provide a specific definition or explanation for the term "usion."
Standard Oil was created in 1870.
The railroads divided the US into four standard time zones to make their schedules more standard.