Definition of sublevel in US English:

sublevel

noun

Physics
  • Each of a group of energy levels of an atom or other quantized system which coincide under a coarse approximation or when some influence (such as a magnetic field) is removed.

Origin

1920s; earliest use found in Proceedings of the Cambridge Philosophical Society. From sub- + level.

Pronunciation

sublevel

/ˈsʌblɛvl/