Definition of zeroth in English:

zeroth

Syllabification: ze·roth
Pronunciation: /ˈzi(ə)rōTH, ˈzēˌrōTH
 
/

adjective

  • Immediately preceding what is regarded as first in a series.

Origin

late 19th century: from zero + -th1.

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Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody