a priori principle
affirmation
apriorism
assertion
assumed position
assumption
axiom
basis
categorical proposition
condition
conjecture
data
educated guess
first principles
foundation
ground
guess
guesswork
hypothesis ad hoc
inference
lemma
major premise
minor premise
philosopheme
philosophical proposition
position
postulate
postulation
postulatum
premise
premiss
presumption
presupposal
presupposition
proposition
propositional function
set of postulates
speculation
statement
sumption
supposal
supposing
supposition
surmise
theorem
theory
thesis
hypotheses
proposal
Avogadro's hypothesis
Fisher hypothesis
Griesbach hypothesis
Riemann hypothesis
alternative hypothesis
ergodic hypothesis
null hypothesis
analogy
analysis
argument
calculation
definition
experiment
interpretation
phenomenon
philosophy