nonswan

English

Etymology

non- +‎ swan

Noun

nonswan (plural nonswans)

1. That which is not a swan.
   • 1968, Henry Ehlers, Logic by way of set theory, page 294:

     This is not translated "~s," rather, it asserts the existence of at least one nonswan, and thus becomes "~Sa."

   • 1991, Derek Partridge, A New Guide to Artificial Intelligence, page 393:

     Thus, faced with three instances of swans flying west to east and a nonswan (say a crow) flying east to west, an accurate inductive generalization (from this set of four instances) would be that swans fly west to east […]