Definition of scientific notation in US English:

scientific notation

noun

  • 1A system of notation or symbols regarded as, or devised to be, systematic and rational.

  • 2A system of representing some given number as a product of a number with an absolute value between 1 and 10 (or between 0·1 and 1) and a power of 10 (as 2 ×102 or 0.2 × 103 for 200).

Origin

Early 19th century.