Black's Law Dictionary, Sixth Edition, p. 1207:

procuration.  Agency; proxy; the act of constituting another one's attorney in fact.  The act by which one person gives power to another to act in his place, as he could do himself.  Action under a power of attorney or other constitution of agency.  Indorsing a bill or note "by procuration" is doing it as proxy for another or by his authority.  The use of the word procuration (usually, per procuratione, or abbreviated per proc. or p.p.) on a promissory note by an agent is notice that the agent has but a limited authority to sign.

An express  procuration is one made by the express consent of the parties.  An implied or tacit procuration takes place when an individual sees another managing his affairs and does not interfere to prevent it.  Procurations are also divided into those which contain absolute power, or a general authority, and those which give only a limited power.

Also, the act or offence of procuring women for lewd purposes.

See also Proctor; Procure; Proxy.

[Black's Law Dictionary, Sixth Edition, p. 1207]