Encyclopedia > Atto

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Atto- is a prefix (see all prefixes) to a unit and means that it is 10-18 times this unit.

Examples are one attosecond or one attometer. The origin of this prefix is the Danish word atten, which means eighteen.

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... of jewellery were found. A census of Dalriada exists, the Senchus fer n'Alba. Dalriada was conquered militarily by the Picts but eventually overwhelmed them ...