Definition of fastness
1
: the quality or state of being fast: such as
a
: the quality or state of being fixed
b
: the quality or state of being swift
c
: colorfast quality
d
: resistance (as of an organism) to the action of a usually toxic substance
2a
: a fortified or secure place
b
: a remote and secluded place
vacationed in their mountain fastness
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Merriam-Webster unabridged
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Time Traveler for fastness
The first known use of fastness was before the 12th century
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