• noun the forcing of air upwards from the Earth’s surface, as when a cold front overtakes and flows under a warm front
  • The process of obstructing, closing, or preventing the passage of. For instance, the blocking of electromagnetic radiation.
  • That which obstructs, closes, or prevents from passing. For instance, an obstacle which blocks electromagnetic radiation.
  • That which is obstructed, closed, or prevented from passing. For instance, a gas that is trapped within a crystal lattice.

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