Vegetables are the principal ingredients in this soup.
She is the principal cellist of the orchestra.
If any suspect that Griswold was exaggerating, they should reflect on the fact that the principal Supreme Court case justifying the invocation of the national security privilege was based on a governmental lie. —Garry Wills, New York Review of Books, 12 Feb. 2009
Following the agreement, the four principal tobacco companies—Philip Morris, R. J. Reynolds, Brown & Williamson, and Lorillard—raised their prices more than 45 cents per pack. The costs of the settlement, as predicted, were passed on to consumers. —Allan M. Brandt, The Cigarette Century, 2007
Their principal industry was the manufacture, in a long, low, mostly-wooden, two-story factory, of cold cream. —Frederick Busch, Too Late American Boyhood Blues, 1984