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 …

Look up zeroth in Wiktionary, the free dictionary.

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.

17 hours ago · /PRNewswire/ -- Today at CES 2026, Zeroth Robotics emerged from stealth with its official U.S. launch and a lineup of five interactive AI robots designed for...

17 hours ago · A robotics startup called Zeroth is launching a home companion robot in the US that resembles Disney and Pixar’s WALL-E.

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" typically refers to something that comes before the "first" in a series, process or system. It's often used in laws, principles or rules in various scientific fields, denoting the principle that …

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: …

Zeroth is an adjective. The adjective is the word that accompanies the noun to determine or qualify it.