Massless

Pronunciation: /ˈmæsˈɫɛs/

Massless (adjective)

  1. Having zero mass; the amount of matter is treated as 0 in a model or theory.
  2. Describing an object in calculations as if it has no mass to simplify the problem.

Examples

  • The photon is massless in many physics models.
  • In theory, a particle can be massless and still move.