Definitions

from The Century Dictionary.

  • noun In geology, the ideal level surface with reference to which the erosive action of a stream is carried on; also, but less generally, the slope at which the erosive action of a stream practically ceases.
  • noun The level of the bottom plane of an engine or machinery; the level at which the bottom of the base is set.
  • noun In geology, the level at which the erosive action of a stream, in a given area, ceases.

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