Definition of eleventh

• a. - Next after the tenth; as, the eleventh chapter.
• a. - Constituting one of eleven parts into which a thing is divided; as, the eleventh part of a thing.
• a. - Of or pertaining to the interval of the octave and the fourth.
• n. - The quotient of a unit divided by eleven; one of eleven equal parts.
• n. - The interval consisting of ten conjunct degrees; the interval made up of an octave and a fourth.