tenth

tenth

noun \ˈten(t)th\

: the number 10 in a series

: one of 10 equal parts of something

plural tenths \ˈten(t)s, ˈten(t)ths\

Full Definition of TENTH

1

— see number table

2

a :  a musical interval embracing an octave and a third

b :  the tone at this interval

— tenth adjective or adverb

Yes, "irregardless" is a word. No, that
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Examples of TENTH

1. He was tenth in line.
2. He traded stocks for one tenth their face value.
3. I only paid a tenth of what you did for that jacket.

First Known Use of TENTH

13th century