fastness

[fast-nis, fahst-]
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:
before 900; Middle English; Old English fæstnes. See fast1, -ness

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fastness (ˈfɑːstnɪs)
 
n
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
 
[Old English fæstnes; see fast1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

fastness
"a place not easily forced, a stronghold," late O.E., from fast (adj.) in its older sense of "firm, fixed in place" + -ness.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Fastness and apparent efficiency are overthrowing legal procedures.
The fastness and stability characteristics of the individual brighteners are given in the tables in the appendix.
They also have higher fixation rates and better fastness properties.
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