The ordinal form of one hundred; being number 100 in a sequence. One part of a hundred equal parts.
From Old English 'hundtēogoða', combining 'hund' (hundred) and the ordinal suffix '-th'. The word 'hundred' itself comes from a Germanic compound meaning 'ten times ten'.
The suffix '-th' that creates ordinal numbers is one of English's most productive patterns, yet it's quite irregular - we say 'first, second, third' but then switch to '-th' for most others. 'Hundredth' represents the triumph of pattern over irregularity in our number system.
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