คำว่า ' ninth ' ( PRON )
มีความหมายในภาษาไทยว่า ลำดับที่เก้า
คำนิยามในภาษาอังกฤษ (definition) :
[a.] Following the eight and preceding the tenth; coming after eight others.
[a.] Constituting or being one of nine equal parts into which anything is divided.
[n.] The quotient of one divided by nine; one of nine equal parts of a thing; the next after the eighth.
[n.] An interval containing an octave and a second.
[n.] A chord of the dominant seventh with the ninth added.