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 (trăns-mĭt′ns, trănz-)
1. A transmission.
2. Physics The ratio of the radiant energy transmitted to the total radiant energy incident on a given body.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. the act of transmitting
2. (General Physics) physics Also called: transmission factor a measure of the ability of anything to transmit radiation, equal to the ratio of the transmitted flux to the incident flux; the reciprocal of the opacity. For a plate of material the ratio of the flux leaving the entry surface to that reaching the exit surface is the internal transmittance. Symbol: τ Compare reflectance, absorptance
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(trænsˈmɪt ns, trænz-)

Physics. the ratio of the radiant flux transmitted through and emerging from a body to the total flux incident on it: equivalent to 1 minus the absorptance.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.transmittance - the fraction of radiant energy that passes through a substancetransmittance - the fraction of radiant energy that passes through a substance
coefficient - a constant number that serves as a measure of some property or characteristic
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The results catalogue includes linear ([PSI] -- value) and point (X -- value) transmittances for slab edges, parapets, glazing transitions, corners, interior wall intersections, concrete curbs on roofs, and panel joints for a variety of common assemblies.
Optical transmittances of the GZO thin films were measured by using a UV-VIS spectrophotometer.
TABLE 1: Transmittances of UV absorbing films with different center wavelengths (i.e., 450,500,550, and 600 nm) at different regions (i.e., UVB, UVA, and visible).
First, incident light frequency's effect on the transmittance of various color channels was analyzed according to the Beer-Lambert Law, from which a proportion among various channel transmittances was derived; after that, images were preprocessed by downsampling to refine transmittance, and then the original size was restored to enhance the operational efficiency of the algorithm; finally, the transmittance of all color channels was acquired in accordance with the proportion, and then the corresponding transmittance was used for image restoration in each channel.
In this study, the mean value RSD of transmittances of the communal peaks was calculated.
The i-skyradiometer (POM-02) used in SKYNET is a unique instrument that can measure zenith transmittances at 1.6 and 2.2 [micro]m wavelengths similar to those of MODIS (moderate resolution imaging spectroradiometer) and can derive [[tau].sub.c] and [R.sub.eff] simultaneously.
Their direct visible transmittances are shown in Figure 2 as a function of solar incidence angle.
The spectral transmittances of snow-covered ice and snow-free ice show a similar shape in February and March, with a maximum in the middle of the PAR band.
Having acquired the effective thermal conductivities of thermal insulation layers with vertical air gaps of various heights and widths, the effective thermal transmittances of horizontal thermal insulation layers and the corrections of these coefficients to evaluate the influence of the air gaps were calculated (Table 3).
Figure 2 shows transmittances and reflectances (front and back) as a function of wavelength for the whole glazing.
The values of thermal transmittance and resistance were measured in accordance with ASTM D 1518-85--standard test method for the determination of thermal characteristics of insulating material having thermal transmittances in the range 0.7 to 14W/[m.sup.2]K and thickness not exceeding 50mm.