**diallelus** *noun.* (Latin < Greek *di allelon* "through or by means of one another")**1.** In logic, a circle in proof; an attempt to prove one proposition by another

which is itself proved only by the first.**2.** Also known as Infinite Regress, a problem in epistemology and, in general,

a problem in any situation where a statement has to be justified. According to this argument,

any proposition requires a justification. However, any justification itself requires support.

This means that any proposition whatsoever can be endlessly (infinitely) questioned.

© Adam Beaumont 2015