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Definition of mathematician:
Synonyms:
approximation, algorithm, decimal place, binomial, countdown, calculation, algorithm, computational, average, abacus, deviation.
Usage examples:

Most of the settlers who went with Lane were mere gold hunters, but there were two who would have been valuable to any society the mathematician Thomas Hariot, who surveyed the country and wrote an account of the settlement; and John White, who made more than seventy beautiful water colors representing the dress of the Indians and their manner of living.
 "England in America, 15801652", Lyon Gardiner Tyler. 
" In a shorter time," sighed the mathematician, " if it must be so.
 "A Struggle for Rome, Vol. 2 (of 3)", Felix Dahn. 
A few years later, and the Harvard faculty contained such eminent men as Josiah Quincy, Judge Joseph Story, Benjamin Peirce, the mathematician, George Ticknor, and Edward Everett, and the opportunities for serious study were broadened out immensely.
 "William Hickling Prescott", Harry Thurston Peck.