1856, Robert Gordon Latham, Logic in the Application to Language, We now see that they propositions are either conditional or unconditional, or, as the logicians say, hypothetical (conditional) or categorical (unconditional).
1900, Sigmund Freud, The Interpretation of Dreams, Avon Books, (translated by James Strachey) pg. 74:Daytime interests are clearly not such far-reaching psychical sources of dreams as might have been expected from the categorical assertions that everyone continues to carry on his daily business in his dreams.
