theosophy: a system of belief based on mystical insight into the nature of God and the soul
method: a way of doing something, especially a systematic way; implies an orderly logical arrangement (usually in steps)
united states customary system: the system of weights and measures based on the foot and pound and second and pint that dates back to colonial America but differs in some respects from the British Imperial System; today in the United States this system exists side by side with the SI system