You don't have to be a rocket scientist to use zeroth, but the word, which was coined by physicists 120 years ago, does often show up in scientific contexts. (It comes from zero, which is itself from Arabic …

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Dec 14, 2025 · zeroth (not comparable) (mathematics) In the initial position in a sequence whose elements are numbered starting at zero; the ordinal number corresponding to zero.

zeroth in American English (ˈzɪərouθ) adjective coming in a series before the first

ZEROTH definition: coming in a series before the first. See examples of zeroth used in a sentence.

zeroth, adj. meanings, etymology, pronunciation and more in the Oxford English Dictionary

Define zeroth. zeroth synonyms, zeroth pronunciation, zeroth translation, English dictionary definition of zeroth. adj. Of or relating to the ordinal number matching the number 0 in a series: the zeroth power …

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Zeroth definition: Of or relating to the ordinal number matching the number 0 in a series.