-eth Morpheme -eth Type suffix Denotation ordinal number suffix Etymology Middle English -th, -eth, -the, -ethe; Old English -þa, -þe, -oþa Evidence eightieth, fiftieth, fortieth, ninetieth, seventieth, sixtieth, thirtieth, twentieth See Also -th Homographs Eth, Eth, Eth, Eth Share on FacebookTweetSave