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fastness

[fast-nis, fahst-] /ˈfæst nɪs, ˈfɑst-/
noun
1.
a secure or fortified place; stronghold:
a mountain fastness.
2.
the state of being fixed or firm:
the fastness of democratic institutions.
3.
the state of being rapid.
Origin of fastness
900
before 900; Middle English; Old English fæstnes. See fast1, -ness
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for fastness

fastness

/ˈfɑːstnɪs/
noun
1.
a stronghold; fortress
2.
the state or quality of being firm or secure
3.
the ability of a dye to remain permanent and not run or fade
4.
(archaic) swiftness
Word Origin
Old English fæstnes; see fast1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fastness
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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11
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