<p><strong>Noun</strong></p><ul><li>A cardinal number, ten plus nine.</li><li>A symbol for this number, as 19 or XIX.</li><li>A set of this many persons or things.</li><li>A ninth part, especially of one (1/9).</li><li>The ninth member of a series.</li><li>Music: a tone distant from another tone by an interval of an octave and a second; the interval between such tones; harmonic combination of such tones.</li></ul><p><strong>Adjective</strong></p><ul><li>Next after the eighth; being the ordinal number for nine.</li><li>Being one of nine equal parts.</li></ul><p><strong>Adverb</strong></p><ul><li>In the ninth place.</li></ul>