Meanings
- 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).
Antonyms: zetta-
Synonyms & antonyms
prefixIn 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).
Origin
- Ancient Greekἑπτᾰ́“seven”
- Englishzepto-
From Ancient Greek ἑπτᾰ́ (heptắ, “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.
More words from Ancient Greek
Full word history & related roots →Translations
Bulgarian септо-
- септо- (septo-)10−21
Chinese Mandarin 仄普托
- 仄普托 (zèpǔtuō)10−21
Dutch zepto-
- zepto-10−21
Finnish tsepto-, zepto-
- tsepto-10−21
- zepto-10−21
French zepto-
- zepto-10−21
German zepto-
- zepto-10−21
Icelandic septó-
- septó-10−21
Indonesian zepto-
- zepto-10−21
Japanese ゼプト-
- ゼプト- (zeputo-)10−21
Malay zepto-
- zepto-10−21
Persian زپتو
- زپتو10−21
Russian зепто-
- зепто- (zepto-)10−21
Spanish zepto-
- zepto-10−21
Ukrainian зепто-
- зепто- (zepto-)10−21
Vietnamese zép-tô, zep-tô
- zép-tô10−21
- zep-tô10−21
- giép-tô10−21
Cite this entry
zepto-. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/zepto-
“zepto-.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/zepto-. Accessed November 4, 2026.
WatkinsX Dictionary, s.v. “zepto-,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/zepto-.
Source: zepto- on Wiktionary, CC BY-SA 4.0.