Wiktionary:Word of the day/2021/November 1

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fastness n

(uncountable) The quality or state of being fast (in various senses). The quality or state of being strongly attached; firmness, secureness, tenacity. (specifically) The ability of a dye to withstand fading. The quality or state of moving quickly; quickness, rapidity, swiftness. The quality or state of having an extravagant lifestyle or immoral habits. (archaic) Of a fortress or other place: the quality or state of being secure from access or attack; safety, security. (obsolete) The quality or state of being firm, hard, or solid; firmness, hardness, solidity. (countable) Something that is fast, or that causes someone or something to be fast (in various senses). (also figuratively) A fortified or secure place; a fortress, a stronghold. (obsolete except British, regional) Something used to fasten or tie; a fastener or fastening.

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