fastness

Short definition from Wiktionary

Noun

1. 1
   The quality or state of being fast (in various senses): The quality or state of being strongly attached; firmness, secureness, tenacity.
2. 2
   The quality or state of being strongly attached; firmness, secureness, tenacity: The ability of a dye to withstand fading.
3. 3
   The quality or state of being fast (in various senses): The quality or state of moving quickly; quickness, rapidity, swiftness.
4. 4
   The quality or state of being fast (in various senses): The quality or state of having an extravagant lifestyle or immoral habits.
5. 5
   The quality or state of being fast (in various senses): Of a fortress or other place: the quality or state of being secure from access or attack; safety, security.
6. 6
   The quality or state of being fast (in various senses): The quality or state of being firm, hard, or solid; firmness, hardness, solidity.
7. 7
   Something that is fast, or that causes someone or something to be fast (in various senses): A fortified or secure place; a fortress, a stronghold.
8. 8
   Something that is fast, or that causes someone or something to be fast (in various senses): Something used to fasten or tie; a fastener or fastening.