Upper-Intermediate (B2)
IPA: /rɪˈflɛktəns/
KK: /rɪˈflɛktəns/
Definition
The amount of light or other radiation that is reflected off a surface compared to the amount that hits it.
Example
The reflectance of the water surface changes depending on the angle of the sun.
Conversation

I read an interesting article about reflectance and how it affects color perception.

Oh really? I didn't know that could change how we see colors.

Yeah, it mentioned how different surfaces have varying reflectance values.

That makes sense! I guess that's why some colors look different in different lighting.
Synonyms & Antonyms
Synonyms
reflectivity
emittance
radiance
Antonyms
absorbance
transmittance
opacity
Root Explanation
Reflectance → It is formed from "re-" (meaning back) and "flectere" (meaning to bend). The word describes the property of light bending back when it strikes a surface.
Memory Tip
Think of light bending 'back' ('re-') when it hits a surface ('flectere') — that's what reflectance means.
Visually Confused Words
reluctance
relevance
reactance