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.

Definition of zeroth in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something