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Noun: fastness  fãst-nus
  1. A rate (usually rapid) at which something happens
    "the project advanced with gratifying fastness";
    - speed, swiftness
  2. The quality of being fixed in place as by some firm attachment
    - fixedness, fixity, fixture, secureness
  3. A strongly fortified defensive structure
    - stronghold

See also: fast, slow

Type of: defence [Brit, Cdn], defense [US], defensive structure, immovability, immovableness, pace, rate