ninth /naɪnθ/noun 3verb 2adjective 1forms 3phrases 2 noun3 •The person or thing in the ninth position. •One of nine equal parts of a whole. •The compound interval between any tone and the tone represented on the ninth degree of the staff above it, as between one of the scale and two of the octave above; the octave of the second, consisting of 13 or 14 semitones (called minor and major ninth). verb2 •To divide by nine.THE NINTHER-MEAN COMBINATION When data are only a little worse than usual, so far as wild and straggling values are concerned, we can do well enough by taking means of the results of ninthing. — 2014 •To lose a ninth.οὐ[δ̓] ὲνατεὐεται, should be translated “a tithe (offering or fee) is not given (or paid)”, “no tithing” (literally, “a ninth is not given”, “no ninth-ing”, if I may coin such a word). — 1973 adjective1 •The ordinal form of the number nine. formsninthed · ninthing · ninths Phrases with ninth bottom of the ninthThe second part of the ninth and final inning; the end of the game. ninth-inningHappening in the ninth inning of a baseball game.