ninth
num. · n.-
1 position in a sequence (num.) A2 Elementarycoming after the eighth and before the tenth.
the ordinal number matching the cardinal number nine in a series.
ExampleThis is the ninth time I have tried to call the bank today.
ExampleThe ninth chapter of the report provides a detailed breakdown of the fiscal discrepancies discovered during the autumn audit.
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2 a fraction (n.) B1 Intermediate Mathone of nine equal parts of a whole.
one of nine equal parts into which a whole is or may be divided.
ExampleIf you cut the cake into nine pieces, each piece is one ninth.
ExampleThe surveyor noted that approximately one ninth of the total acreage was unsuitable for residential development due to the high water table.
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3 musical interval (n.) C1 Advanced Technical Musica musical note that is eight notes above another note.
the interval between any tone and the tone represented on the ninth degree of the staff above it.
ExampleThe composer used a major ninth to create a dreamy, open sound.
ExampleThe pianist struggled with the reach required for the dominant ninth chord in the final movement of the concerto.
From Middle English nynthe, nynte, from Old English niġoþa, from Proto-Germanic *newundô; the -n- was reinserted by analogy with nine. Equivalent to nine + -th (ordinal suffix).