1. next after ninth; being the ordinal number for ten. 2. being one of ten equal parts. n. 3. a tenth part, esp. of one (1/10). 4. the tenth member of a series. 5. a. a musical interval encompassing an octave and a third. b. a tone at this interval. c. the harmonic combination of two tones a tenth apart. 6. More @Wikipedia
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