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fastness (n.)

"a place not easily forced, a stronghold," late Old English fæstnes "firmness, strongness, massiveness, stability; the firmament," from fast (adj.) in its older sense of "firm, fixed in place" + -ness.

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Definitions of fastness from WordNet

fastness (n.)
a rate (usually rapid) at which something happens;
Synonyms: speed / swiftness
fastness (n.)
the quality of being fixed in place as by some firm attachment;
Synonyms: fixedness / fixity / fixture / secureness
fastness (n.)
a strongly fortified defensive structure;
Synonyms: stronghold
From wordnet.princeton.edu