Word.ws English Dictionary

atto-

atto- prefix: in the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻¹⁸ (short scale quintillionth or long scale trillionth).

Prefix

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 (short scale quintillionth or long scale trillionth).

atto- meaning in Tamil and Vietnamese

atto- in Tamil

அட்டோ

atto- in Vietnamese

unit of measure
a-tô

Antonyms of atto-

Origin of atto-

From Danish atten (“eighteen”), with reference to the (negative) exponent in the relevant power of ten; the same principle also explains femto-.

Questions about atto-

What does atto- mean?
Atto- means in the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻¹⁸ (short scale quintillionth or long scale trillionth).
What is atto- in Tamil?
Atto- in Tamil is அட்டோ. See Atto- meaning in Tamil.
What part of speech is atto-?
Atto- is a prefix.

Words near atto- in the dictionary

  1. Attlee
  2. Attleean
  3. attn
  4. Attnang-Puchheim
  5. Atto
  6. atto-
  7. atto-meter
  8. atto-meters
  9. atto-metre
  10. atto-metres
  11. atto-mole

Source and license

Adapted from Wiktionary: atto- (page history and authors); atto- (Tamil Wiktionary) (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “atto-.” Word.ws, https://word.ws/atto-. Based on Wiktionary, CC BY-SA 4.0.