a public proclamation; a manifesto or edict issued by authority.-permission given by authority; a license; as, to give a placard to do something.-a written or printed paper, as an advertisement or a declaration, posted, or to be posted, in a public place; a poster.-an extra plate on the lower part of the breastplate or backplate.-a kind of stomacher, often adorned with jewels, worn in the fifteenth century and later.-to post placards upon or within; as, to placard a wall, to placard the city.-to announce by placards; as, to placard a sale.