American Heritage Dictionary
(1)
Century Dictionary
(3)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Pythagoras the Greek philosopher and mathematician was the man who postulated, that "world is built upon numbers".— Softpedia - Windows - All
Now, her occupation -- mathematician -- has landed at the top spot on a new study ranking the best and worst jobs in the U.S.— The Full Feed from HuffingtonPost.com
Next to al-Khwarizmi, the most important mathematician was the Persian scholar and poet Omar Khayyam (1048-1131).— The Brussels Journal - The Voice of Conservatism in Europe
It went against his grain to imagine that a mathematician could be a logician.— A Budget of Paradoxes, Volume I (of II)

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a month.
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