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[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.
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

“a place not easily forced, a stronghold,” late Old English fæstnes, from fast (adj.) in its older sense of “firm, fixed in place” + -ness.


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  • Fast neutron

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  • Fast-one

    noun, Informal. 1. a shrewd action, especially when unscrupulous or dishonest; an unfair trick, deceitful practice, dishonest dealing, etc.: He pulled a fast one on me by paying me with a worthless check. noun phrase A trick or deception; clever subterfuge; dipsy-doodle: That was sure a fast one, you wearing the false mustache Related Terms […]

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