And therefore in geometry (which is the only science that it hath pleased God hitherto to bestow on mankind), men begin at settling the significations of their words; which settling of significations, they call definitions, and place them in the beginning of their reckoning.
Thomas HobbesWhen the nature of the thing is incomprehensible, I can acquiesce in the Scripture: but when the signification of words is incomprehensible, I cannot acquiesce in the authority of a Schoolman.
Thomas Hobbes