Definition of fastness
1 : the quality or state of being fast: such asa : the quality or state of being fixedb : the quality or state of being swiftc : colorfast qualityd : resistance (as of an organism) to the action of a usually toxic substance
2a : a fortified or secure placeb : a remote and secluded place vacationed in their mountain fastness
Indulge Your Inner Word Nerd
Examples of fastness in a Sentence
the amazing fastness with which the boy took his shower had us wondering if he'd used any water
the guerillas retreated to their network of hidden fastnesses deep within the mountains
First Known Use of fastness
before 12th century
FASTNESS Defined for English Language Learners
fastness
playDefinition of fastness for English Language Learners
-
: a place that is difficult to get to or that can be easily defended if it is attacked
Medical Dictionary
fastness
playMedical Definition of fastness
: resistance (as of an organism) to the action of a usually toxic substance streptomycin fastness developed by a strain of tubercule bacillus
Learn More about fastness
Seen and Heard
What made you want to look up fastness? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!