'Fastness' definitions:

Definition of 'fastness'

From: WordNet
noun
A rate (usually rapid) at which something happens; "the project advanced with gratifying speed" [syn: speed, swiftness, fastness]
noun
The quality of being fixed in place as by some firm attachment [syn: fastness, fixedness, fixity, fixture, secureness] [ant: looseness]
noun
A strongly fortified defensive structure [syn: stronghold, fastness]

Definition of 'Fastness'

From: GCIDE
  • Fastness \Fast"ness\, n. [AS. f[ae]stnes, fr. f[ae]st fast. See Fast, a.]
  • 1. The state of being fast and firm; firmness; fixedness; security; faithfulness. [1913 Webster]
  • All . . . places of fastness [are] laid open. --Sir J. Davies. [1913 Webster]
  • 2. A fast place; a stronghold; a fortress or fort; a secure retreat; a castle; as, the enemy retired to their fastnesses in the mountains. [1913 Webster]
  • 3. Conciseness of style. [Obs.] --Ascham. [1913 Webster]
  • 4. The state of being fast or swift. [1913 Webster]