background radiation background processing • background signal · · · Info · Definitions · Characters · · background radiation · · Text Common · · Latin · · Scripts 20 · · Length 6 · · Syllables Definitions · · · (noun) radiation coming from sources other than those being observed. Synonyms: background radiation. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 d latin small letter d U+0064 g latin small letter g U+0067 i latin small letter i U+0069 k latin small letter k U+006B n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075