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“(1) The SI definition, a prefix used to form decimal submultiples of the SI unit “meter”, designating a factor of 10-9 denoted by the symbol “n”. (2) Pertaining to things on a scale of approximately 1 to 100 nanometers (nm). (3) A prefix referring to an activity, material, process or device that pertains to a field of knowledge defined by nanotechnology and nanoscience.”1

1. ASTM International, “Standard Terminology Relating to Nanotechnology,” E2456-06, § 4 (Dec. 2006).