Wordnet 3.0
NOUN (1)
1.
a system of principles for philosophic or scientific investigations;
an instrument for acquiring knowledge;
The Collaborative International Dictionary of English v.0.48:
Organon \Or"ga*non\, Organum \Or"ga*num\, n. [NL. organon, L.
organum. See Organ.]
An organ or instrument; hence, a method by which
philosophical or scientific investigation may be conducted;
-- a term adopted from the Aristotelian writers by Lord
Bacon, as the title ("Novum Organon") of part of his treatise
on philosophical method. --Sir. W. Hamilton.
[1913 Webster]
WordNet (r) 3.0 (2006):
organon
n 1: a system of principles for philosophic or scientific
investigations; an instrument for acquiring knowledge