Fastness Definition

făstnĭs
fastnesses
noun
fastnesses
The quality or condition of being fast.
Webster's New World
The quality or condition of color retention; colorfastness.
American Heritage
A secure place; stronghold.
Webster's New World
A remote, secret place.
American Heritage

The ability of a dye to withstand fading.

Wiktionary

Other Word Forms of Fastness

Noun

Singular:
fastness
Plural:
fastnesses

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