Possible Clues:

• A __: based on deduction rather than experience
• A _______ (Latin for "from the former")
• A ___ (conceived beforehand)
• A ___ (theoretical)
• A __: valid independent of experience, in logic
• A ___ (already conceived)
• A ___ (assumed true)
• A ___ (kind of reasoning)
• Before analysis, after 'a'
• A ___ (in theory)