noun (n)

• a rate (usually rapid) at which something happens(noun.attribute)

  Synonym:
  speed, swiftness
  

  source: wordnet30
• the quality of being fixed in place as by some firm attachment(noun.attribute)

  Synonym:
  fixedness, fixity, fixture, secureness
  Antonym:
  looseness
  

  source: wordnet30
• a strongly fortified defensive structure(noun.artifact)

  Synonym:
  stronghold
  

  source: wordnet30
• The state of being fast and firm; firmness; fixedness; security; faithfulness.(noun)

  source: webster1913