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New American Oxford Dictionary

zeroth

ze roth |ˈzi (ə )rōTH, ˈzēˌrōTH ˈzɪroʊθ | ▶adjective immediately preceding what is regarded as first in a series. ORIGIN late 19th cent.: from zero + -th 1 .

 

Oxford Dictionary

zeroth

zeroth |ˈzɪərəʊθ | ▶adjective immediately preceding what is regarded as first in a series. ORIGIN late 19th cent.: from zero + -th 1 .