I happened to find that definition of the word, ‘regimen’ has the meaning of ‘governing word’ such as prepositions (sic from Reader’s English Japanese Dictionary) besides a popular notion of ‘a set of rules about food and exercise or medical treatment to stay healthy, or improve one’s health.’
What does ‘regimen’ as a grammatical term mean? What are they? How do they function? Are they different from simple modifiers such as adjectives and subordinate clauses?