Dictionary.net

Domestic relations. An infant placed by authority of law under the care of a guardian.

While under the care of a guardian a ward can make no contract whatever binding upon him, except for necessaries. When the relation of guardian and ward ceases, the latter is entitled to have an account of the administration of his estate from the former. During the existence of this relation, the ward is under the subjection of his guardian, who stands in locoparentis.

A district. Most cities are divided for various purposes into districts, each of which is called a ward.

Police. To watch in the day time, for the purpose of preventing violations of the law.

It is the duty of all police officers and constables to keep ward in their respective districts.