[ fast-nis, fahst- ]
/ ˈfæst nɪs, ˈfɑst- /


a secure or fortified place; stronghold: a mountain fastness.
the state of being fixed or firm: the fastness of democratic institutions.
the state of being rapid.

Origin of fastness

before 900; Middle English; Old English fæstnes. See fast1, -ness Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for fastness

British Dictionary definitions for fastness

/ (ˈfɑːstnɪs) /


a stronghold; fortress
the state or quality of being firm or secure
the ability of a dye to remain permanent and not run or fade
archaic swiftness

Word Origin for fastness

Old English fæstnes; see fast 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012