Definition from Wiktionary, the free dictionary
From Ancient Greek νόμος (nomos, “law, custom”).
-nomy (or -onomy when including the connecting vowel -o- that is commonly used in connecting two elements of Greek origin)
- a system of rules, laws, or knowledge about a body of a particular field; distribution, arrangement, management
Derived terms 
Related terms 
system of rules, laws, or knowledge about a particular field