Definition of Qua:
England, at peace with all the rest of the world, carried on a war with America; yet the latter, single- handed, not only met and contended with, but repelled the mighty power of her adversary, and by the equity of her cause, and the bravery of her citizens, she conquered a peace, in spite of the threats of England's haughty, bullying, ignorant, and intolerant Ministers, who had declared that the right of search was a sine qua non which must form the basis of any negotiation.- "Memoirs of Henry Hunt, Esq. Volume 3", Henry Hunt.
- "The Student's Companion to Latin Authors", George Middleton Thomas R. Mills.
- "Selections from Viri Romae", Charles François L'Homond.