(of a material or object) See-through, clear; having the property that light passes through it almost undisturbed, such that one can see through it clearly.
(of a system or organization) Open, public; having the property that theories and practices are publicly visible, thereby reducing the chance of corruption.
Obvious; readily apparent; easy to see or understand.
Having the property of transparency, i.e. sufficiently accurate that the compressed result is perceptually indistinguishable from the uncompressed input.
Not noticeable because it happens automatically or in the background; invisible.