Wiktionary
a. 1 Being of secondary consequence to a causal chain of processes, but playing no causal role in the process of interest.Huettel, ''Function Magnetic Imaging'', 2004. 2 (context philosophy psychology English) Of or pertaining to a mental process which occurs only as an incidental effect of electrical or chemical activity in the brain or nervous system.
Usage examples of "epiphenomenal".
All subjective experience is an epiphenomenal consequence of the motions and metamorphoses of matter.
Virtual Reality, you might say, is the actual mode of being of the inessential, the epiphenomenal, and the non-conceptual: of all that is unpredictable, unexpected, transitory, contingent, or exceptional.
Not some yapping AI designed to manage traffic lights or zoning complaints or currency markets, but the epiphenomenal chimera that was well beyond the sum total of all these petty transactions.