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- A statement that is not proved but rather supposed or held as obvious, forming together with other such statements the basis of a system of statements obtained from them by inference; an axiom.
- 1836, John Abercrombie, Jacob Abbott, The Philosophy of the Moral Feelings:
- These are the principles also treated of, in a former work, under the name of First Truths. They are not, like our knowledge of the other kind, the result of any process either of investigation or of reasoning; and, for the possession of them, no man either depends upon his observation, or has recourse to that of other men.