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Definition 2025

atto-

atto-

See also: atto, attó, and attõ

English

Prefix

SI prefix
a Previous: zepto-
Next: femto-

atto-

  1. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10−18. Symbol: a

Antonyms

Derived terms

<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:English_words_prefixed_with_atto-'>English words prefixed with atto-</a>

Translations

Catalan

Etymology

From Danish atten ‎(“eighteen”).

Prefix

atto-

  1. atto-

Danish

Etymology

From atten ‎(“eighteen”).

Prefix

atto-

  1. atto-

Dutch

Pronunciation

Etymology

From Danish atten ‎(“eighteen”).

Prefix

atto-

  1. atto-
<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:Dutch_words_prefixed_with_atto-'>Dutch words prefixed with atto-</a>

Finnish

Prefix

atto-

  1. atto-

French

Prefix

atto-

  1. atto-

Etymology

From Danish atten ‎(“eighteen”).

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