Definition of non-impact in US English:

non-impact

adjective

  • Not involving or characterized by impact (literal and figurative); (Computing) designating or relating to printing that does not involve the contact of printing elements with the paper; (also, of a fitness regime) designed to put little or no harmful stress on the body.

noun

  • A decided absence or lack of impact; an insignificant or negligible impact.

Origin

1930s; earliest use found in Webster's New International Dictionary of the English Language. From non- + impact.

Pronunciation

non-impact

/nɒnˈɪmpakt/