general power of attorney
A legal document granting broad authority to an agent to act on behalf of the principal in various matters.
I prepared a general power of attorney and entrusted the procedures to an agent.
委任状 is a broader term for any power of attorney, while 包括委任状 specifically refers to a general (comprehensive) power of attorney.
Compound of 包括 (comprehensive) + 委任 (delegation) + 状 (document). The term is a direct translation of the English legal phrase 'general power of attorney'.