Definition of near field in English:

near field

Pronunciation /nɪə ˈfiːld/

noun

Physics
  • The region close to a radiating source (especially of sound or radio waves), where the variation of the field vector with distance differs from that at large distances.

    The near field is generally taken as extending a distance from the source equal to the wavelength λ, or to 2L 2/λ, where L is the diameter of the source.

Origin

1930s; earliest use found in Wireless Engineer. From near + field.