1. fastness - noun
· a rate (usually rapid) at which something happens; "the project advanced with gratifying speed"
2. fastness - noun
· the quality of being fixed in place as by some firm attachment
Synonym(s): fixedness, fixity, fixture, secureness
Hypernym(s): immovability, immovableness
3. fastness - noun
· a strongly fortified defensive structure
Synonym(s): stronghold
Hypernym(s): defensive_structure, defense, defence
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