FASTNESS

Definition:

1. [noun] a rate (usually rapid) at which something happens; "the project advanced with gratifying speed"
   Synonyms: speed, swiftness
   
   
2. [noun] the quality of being fixed in place
   Synonyms: fixedness, fixity, fixture, secureness
   
   
3. [noun] a strongly fortified defensive structure
   Synonyms: stronghold
   
   

Synonyms:

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Related Words:

• haste, hastiness, hurry, hurriedness, precipitation
• acceleration
• deceleration, slowing, retardation
• execution speed
• graduality, gradualness
• lodgment, lodgement, lodging
• bastion, citadel
• blockhouse
• hold
• keep, donjon, dungeon
• redoubt, sconce