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Something is divided in four pieces. One piece is called a fourth or a quarter.

Something is divided in nine pieces. One is piece is called a ninth or a... What is the 'quarter' equivalent for something divided by nine?

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There is no corresponding Latinate word for a ninth (that I've ever heard of, at least). If there were, it ought probably to be a none or a noner, which would just be confusing. –  Janus Bahs Jacquet Jan 7 at 2:53
    
Is there a corresponding word for a sixth? A seventh? An eighth? And why is there only one /t/ in eighth? –  FumbleFingers Jan 7 at 2:59
    
@FumbleFingers logically, an eighth is an octave. –  cde Jun 1 at 22:15
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@cde: I think I'd be inclined to say the relationship between 8 and octave is more akin to 3 and triplet (or triad). That's to say, an octave is a thing made up of 8 parts, not one of the 8 parts that make up a thing. –  FumbleFingers Jun 2 at 3:24
    
@FumbleFingers wouldn't that be the difference between "a triplet" vs "triplets"? –  cde Jun 2 at 5:56

2 Answers 2

Names for "nine" (non) can be seen in whole numbers, e.g.

Billion trillion quadrillion quintillion sextillion septillion octillion, nonillion, decillion, undcillion, duodecillion, tredicillion, quattuordecillion, quindecillion, sexdecillion, septendecillion, octodecillion, novemdecillion, vigintillion, etc.

but in fractions, I have never seen (other than half and quarter) a word representing a fraction, other than possibly eighth. I think your answer is ninth.

In the metric system, divisions are (deci, centi) milli, micro, nano, pico, etc.

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OED has a definition for...

ninth part n. each of the nine equal parts into which a thing may be divided; (also fig.) denoting a worthless or inadequate object or person, esp. in ninth part of a man.

Other than that the only word I know is pretty specific - it only applies to each of a 9-baby birth...

nonuplet (defn 2.) Each of nine siblings resulting from a single pregnancy. Usu. in pl.

Apparently there's only one in the world (only two sets are known, and all the other babies died).

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