As a noun, the whole body politic, or the aggregate of the citizens of a state, nation, or municipality. The community at large, without reference to the geographical limits of any corporation like a city, town, or county; the people.
As an adjective, open to all; notorious. Open to common use. Belonging to the people at large; relating to or affecting the whole people of a state, nation, or community; not limited or restricted to any particular class of the community.
1) n. the people of the nation, state, county, district or municipality, which the government serves. 2) adj. referring to any agency, interest, property, or activity which is under the authority of the government or which belongs to the people. This distinguishes public from private interests as with public and private schools, public and private utilities, public and private hospitals, public and private lands, and public and private roads.
LAW, PUBLIC. A public law is one in which all persons have an interest.
POLICY, PUBLIC. By public policy is meant that which the law encourages for 
the promotion of the public good. 
     2. That which is against public policy is generally unlawful. For 
example, to restrain an individual from marrying, or from engaging in 
business, when the restraint is general, in the first case, to all persons, 
and, in the second, to all trades, business, or occupations. But if the 
restraint be only partial, as that Titius shall not marry Moevia, or that 
Caius shall not engage in a particular trade in a particular town or, place, 
the restraint is not against public policy,, and therefore valid. 1 Story, 
Eq. Jur. Sec. 274. See Newl. Contr. 472.
PUBLIC. By the term the public, is meant the whole body politic, or all the 
citizens of the state; sometimes it signifies the inhabitants of a 
particular place; as, the New York public. 
     2. A distinction has been made between the terms public and general, 
they are sometimes used as synonymous. The former term is applied strictly 
to that which concerns all the citizens and every member of the state; while 
the latter includes a lesser, though still a large portion of the community. 
Greenl. Ev. Sec. 128. 
     3. When the public interests and its rights conflict with those of an 
individual, the latter must yield. Co. Litt. 181. if, for example, a road is 
required for public convenience, and in its course it passes on the ground 
occupied by a house, the latter must be torn down, however valuable it may 
be to the owner. In such a case both law and justice require that the owner 
shall be fully indemnified. 
     4. This term is sometimes joined to other terms, to designate those 
things which have a relation to the public; as, a public officer, a public 
road, a public passage, a public house.