Emancipation is a legal term to describe a minor’s release from the custody and control of his or her parents or guardian.  Emancipation automatically occurs when a person turns 18, but the Court can grant a limited emancipation order for individuals between ages 16 and 18. 

MCA Title 41, Ch. 1, Part 5. Limited Emancipation

What is Emancipation? brochure from Montana Legal Services Association (MLSA)

Montana G218 [Guide to Turning 18] from the State Bar of Montana, Law Related Education Committee