Zepto-
//ˈzɛp.təʊ// prefix
prefix ·Rare ·Advanced level
Definitions
Prefix
- 1 In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻²¹ (short scale sextillionth or long scale trilliardth). Symbol: z morpheme
Antonyms
All antonymsEtymology
Greek (h)epta- (seven), for the seventh order of 10⁻³. The final o conforms to the finals vowel of the SI series from micro- downwards; the letter z was added, as a start in a series of terms running backwards through the alphabet.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.