URBANITY, n. The kind of civility that urban observers ascribe to dwellers in all cities but New York. Its commonest expression is heard in the words, "I beg your pardon," and it is not consistent with disregard of the rights of others.
USAGE, n. The First Person of the literary Trinity, the Second and Third being Custom and Conventionality. Imbued with a decent reverence for this Holy Triad an industrious writer may hope to produce books that will live as long as the fashion.
TZETZE (or TSETSE) FLY, n. An African insect ("Glossina morsitans") whose bite is commonly regarded as nature's most efficacious remedy for insomnia, though some patients prefer that of the American novelist ("Mendax interminabilis").