atto-

1. a combining form that enters into compounds denoting a unit one-quintillionth (10−18 ) the size of the unit named by the stem.

atto-

prefix

1. a. denoting 10 ^–18

   attotesla

Word History and Origins

Origin of atto-¹

< Danish or Norwegian att ( en ) eighteen + -o-

Word History and Origins

Origin of atto-¹

from Norwegian, Danish atten eighteen

Example Sentences

Official data on sales were not available, but Chinese automaker BYD’s Atto 3 and Indian maker Tata’s Nexon appear to dominate sales of electric passenger sedans.

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For the equivalent of about $50,000, the Atto 3 SUV came with “all these goodies” like a 360-degree dash cam, two years of free charging and an extra set of winter tires.

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“Atto” is the scientific notation prefix that represents 10-18, which is a decimal point followed by 17 zeroes and a 1.

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The Chinese automaker sold more than 26% of all cars in Southeast Asia's small but fast-growing EV market in the second quarter of 2023 and its Atto 3 model, priced starting at $30,000 in Thailand, was the regional bestseller, according to Counterpoint.

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BYD, which has already invested over $200 million in India, markets the Atto 3 electric SUV and the e6 EV to corporate fleets and plans to launch sales of its Seal electric sedan later this year.

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