Definition/Meaning of zepto

• English - Prefix: zepto- In the International System of Units and other metric systems of units , multiplying the unit to which it is attached by 10 −21 . Symbol: z Antonyms zetta- Derived terms zeptoampere zeptobecquerel zeptofarad zeptogram zeptogray zeptohenry zeptojoule zeptometer / zeptometre zeptomole zeptosecond Translations
• English - Etymology: 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 .