1. Adjective
The state of being fast and firm; firmness; fixedness; security; faithfulness.
2. Adjective
A fast place; a stronghold; a fortress or fort; a secure retreat; a castle; as, the enemy retired to their fastnesses in the mountains.
3. Adjective
Conciseness of style.
4. Adjective
The state of being fast or swift.
5. Noun
a strongly fortified defensive structure
Vocabulary classified under Literature and rhetoric
6. Noun
a rate (usually rapid) at which something happens; "the project advanced with gratifying speed"
Vocabulary classified under Economics
7. Noun
the quality of being fixed in place as by some firm attachment
Vocabulary classified under Environmental science
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