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fastness

fast·ness [ fástnəss ] (plural fast·ness·es)


noun 
Definition:
 
1. fixedness: the state or quality of being firm, fixed, or secure
deceived about the fastness of their friendship

2. unfading quality: the ability of a dye to retain its color and not to fade

3. fortress: a fortress, stronghold, or other secure place ( archaic or literary )

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