Answer: ninthly

AnswerCrossword Clue
NINTHLYEnumerator's adverb
ninthlya. tone distant from another tone by an interval of an octave and a second b. the interval between such tones c. harmonic combination of such tones
ninthlyin the ninth place
ninthlybeing one of nine equal parts
ninthlythe ninth member of a series
ninthlyninth part, esp. of one (1/9)
ninthlynext after the eighth; being the ordinal number for nine
ninthlyin the ninth place