Definition of placarding:
(n) :
A sheet of paper or cardboard with a written or printed announcement on one side for display in a public place.
(v) :
To affix a placard to.
(v) :
To announce with placards.
(n) :
(obsolete) A public proclamation; a manifesto or edict issued by authority.
(n) :
The woodwork and frame of the door of a closet etc.
(n) :
(obsolete) Permission given by authority; a license.