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Definition of atto- combining form from the Oxford Advanced Learner's Dictionary

atto-

combining form

/ætəʊ/

/ætəʊ/

(specialist)

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(in units of measurement) a factor of 10-18
- 200 attowatts
Word Originfrom Danish or Norwegian atten ‘eighteen’.

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See atto- in the Oxford Advanced American Dictionary

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adjective

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