1) Acceleration 2) Blockhouse 3) Castle 4) Citadel 5) Deceleration 6) Donjon 7) Dungeon 8) Fixity 9) Fortification 10) Graduality 11) Haste 12) Hastiness 13) Hurriedness 14) Rapidity 15) Redoubt 16) Refuge 17) Retardation 18) Slowing 19) Stronghold 20) Swiftness 1) Exclusively Anglo word 2) Exclusively Saxon word 3) Pace 4) Rate 5) Speed 6) Stronghold 7) Swiftness 8) Word of purely Anglo origin 9) Word with Anglo-Saxon origins 
• (a.) A fast place; a stronghold; a fortress or fort; a secure retreat; a castle; as, the enemy retired to their fastnesses in the mountains. • (a.) The state of being fast or swift. • (a.) The state of being fast and firm; firmness; fixedness; security; faithfulness. • (a.) Conciseness of style.Fastness: words in the definitio...
The state of tolerance exhibited by bacteria to a drug or other agent. ... See: fast. ... (05 Mar 2000) ... 
Resistance of colour to fading.
Fast'ness noun [ Anglo-Saxon fæstnes , from fæst fast. See Fast , adjective ] 1. The state of being fast and firm; firmness; fixedness; security; faithfulness. « All . . . places of fastness [ are] laid open.» Sir J. Davie...
Type: Term Pronunciation: fast′nes Definitions: 1. The state of tolerance exhibited by bacteria to a drug or other agent. See: fast
[n] - the quality of being fixed in place
fixity noun the quality of being fixed in place as by some firm attachment