“I counted two and seventy stenches,
All well defined, and several stinks.”

History of the World, Part I

http://www.margaretthatcher.org/document/108234 On a parliament debate about the Gulf War <br class="br">Third term as Prime Minister

The Complete Neurotic's Notebook (1981), Women & men

Definitions - Scholium
Philosophiae Naturalis Principia Mathematica (1687)
Context: I do not define time, space, place, and motion, as being well known to all. Only I must observe, that the common people conceive those quantities under no other notions but from the relation they bear to sensible objects. And thence arise certain prejudices, for the removing of which it will be convenient to distinguish them into absolute and relative, true and apparent, mathematical and common.

Odeipus
Songs (2002)

Source: Sweethearts

Letter to David Hilbert (2 October 1897)
Context: The totality of all alephs cannot be conceived as a determinate, well-defined, and also a finished set. This is the punctum saliens, and I venture to say that this completely certain theorem, provable rigorously from the definition of the totality of all alephs, is the most important and noblest theorem of set theory. One must only understand the expression "finished" correctly. I say of a set that it can be thought of as finished (and call such a set, if it contains infinitely many elements, "transfinite" or "suprafinite") if it is possible without contradiction (as can be done with finite sets) to think of all its elements as existing together, and to think of the set itself as a compounded thing for itself; or (in other words) if it is possible to imagine the set as actually existing with the totality of its elements.

As quoted in Hear Me Talkin' to Ya : The Story of Jazz as Told by the Men who Made It (1966) by Nat Shapiro and Nat Hentoff, p. 301