vicious circle
circular argument
clincher
determining factor
determiner
elench
Q.E.D.
modus tollendo tollens
argumentum ad ignorantiam
arguendo
monstrance
demonstration
hypothesis
strengthen
corollary
premise
negation
disjunct
modus ponendo tollens
speculate
thesis
reasoning backward
regress
presume
possibly
provable
permissivism
take for granted
assume
refuter
modus tollens
assumption
contention
arguable
premiss
ignoratio elenchi
postulation
argument from ignorance
modus ponens
rational motive
nonassumption
where someone is coming from
taken for granted
self-evident
axiomatic
bear out
apodictic
corroborating evidence
take the meaning
hysteron proteron