In optics, transmission is the property of a substance to permit the passage of light, with some or none of the incident light being absorbed in the process.
ɪn ˈɑːptɪks, tɹænsmˈɪʃən ɪz ðə pɹˈɑːpɚɾi əvə sˈʌbstəns tə pɚmˈɪt ðə pˈæsɪdʒ ʌv lˈaɪt, wɪð sˌʌm ɔːɹ nˈʌn ʌvðɪ ˈɪnsɪdənt lˈaɪt bˌiːɪŋ ɐbsˈoːɹbd ɪnðə pɹˈɑːsɛs.