<p><strong>adjective</strong></p><ul><li>next after the fourth; being the ordinal number for five.</li><li>being one of five equal parts.</li><li>Automotive: of, relating to, or operating at the gear transmission ratio at which the drive shaft speed is greater than that of fourth gear for a given engine crankshaft speed: fifth gear.</li></ul><p><strong>adverb</strong></p><ul><li>in the fifth place; fifthly.</li></ul><p><strong>noun</strong></p><ul><li>a fifth part, especially of one (1/5).</li><li>the fifth member of a series.</li><li>a fifth part of a gallon of liquor or spirits; 4/5 (0.8) of a quart (about 750 milliliters).</li><li>Automotive: fifth gear.</li><li>Music: a tone on the fifth degree from another tone (counted as the first).</li><li>the interval between such tones.</li><li>the harmonic combination of such tones.</li></ul>