Go to 'thermo-' entry Go to 'dino-' entry Go to 'chondro-' entry Go to 'aero-' entry Go to '-logy' entry Go to 'thaumato-' entry Go to 'nano-' entry Go to '-sophy' entry Go to 'bucco-' entry Go to '-ism' entry Go to '-lysis' entry Go to 'galacto-' entry Go to '-anthropy' entry Go to 'pneumo-' entry Go to '-ploitation' entry Go to '-lithic' entry Go to '-sepalous' entry Go to 'onco-' entry Go to '-parous' entry Go to 'dermato-' entry Go to 'multi-' entry Go to 'dodeca-' entry Go to '-zoon' entry Go to 'vermi-' entry Go to 'crystallo-' entry Go to 'biblio-' entry Go to 'eco-' entry Go to 'juxta-' entry Go to 'facio-' entry
Affixes: the building blocks of English
Affixes: the building blocks of English
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-th1 Also -eth.

Forming ordinal and fractional numbers.

[Old English -(o)tha.]

The ending is added to numbers from four onwards to make ordinal numbers that define a thing's position in a series: fourth, fifth, eighth, twenty-ninth, hundredth. When the number ends in y, that letter changes to i and the ending becomes -eth: twentieth, fiftieth, ninetieth. The same form is used in fractions: two fifths, three eighths. See also -teen (for -teenth).

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