Definition of zeroth in English:

zeroth

Pronunciation: /ˈzēˌrōTH//ˈzi(ə)rōTH/

adjective

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

Origin

Late 19th century: from zero + -th.

Pronunciation:

zeroth

/ˈzēˌrōTH//ˈzi(ə)rōTH/