atto-
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atto-
Where it comes from
From Danish atten (“eighteen”), with reference to the (negative) exponent in the relevant power of ten; the same principle also explains femto-.
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).
Opposite: exa-
Thesaurus
prefix
Opposite: exa-
Translations
Talk about this word "atto-." Wiktionary, via Micwyn, micwyn.com/word/atto-. Accessed 6 Nov. 2026. atto-. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/atto- "atto-." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/atto-.Cite this
@misc{atto_2026,
title = {atto-},
howpublished = {Wiktionary, via Micwyn},
year = {2026},
url = {https://micwyn.com/word/atto-},
urldate = {2026-11-06}
}
