adj. 1. one more than eighty-nine and one less than ninety-one; denoting a quantity consisting of ninety items or units; -- representing the number ninety as Arabic numerals Syn. -- ninety, xc [ WordNet 1.5 +PJC ]
adj. 1. coming next after the eighty-ninth in a series Syn. -- ninetieth [ WordNet 1.5 +PJC ]