factor of safety factor of proportionality • factor out · · · Info · Definitions · Synonyms · Characters · · factor of safety · · Text Common · · Latin · · Scripts 16 · · Length 6 · · Syllables Definitions · · · (noun) the ratio of the breaking stress of a structure to the estimated maximum stress in ordinary use. Synonyms: safety factor, factor of safety. · · Noun Definition 1 Synonyms · · · safety factor · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079