'Placard' definitions:

Definition of 'placard'

noun

A sign posted in a public place as an advertisement; "a poster advertised the coming attractions" [syn: poster, posting, placard, notice, bill, card]

verb

Post in a public place

verb

Publicize or announce by placards [syn: placard, bill]

From: GCIDE

Placard \Pla*card"\, n. [F., fr. plaquer to lay or clap on, plaque plate, tablet; probably from Dutch, cf. D. plakken to paste, post up, plak a flat piece of wood.]
1. A public proclamation; a manifesto or edict issued by authority. [Obs.] [1913 Webster]
All placards or edicts are published in his name. --Howell. [1913 Webster]
2. Permission given by authority; a license; as, to give a placard to do something. [Obs.] --ller. [1913 Webster]
3. A written or printed paper, as an advertisement or a declaration, posted, or to be posted, in a public place; a poster. [1913 Webster]
4. (Anc. Armor) An extra plate on the lower part of the breastplate or backplate. --Planch['e]. [1913 Webster]
5. [Cf. Placket.] A kind of stomacher, often adorned with jewels, worn in the fifteenth century and later. [1913 Webster]

From: GCIDE

Placard \Pla*card"\, v. t. [imp. & p. p. Placarded; p. pr. & vb. n. Placarding.]
1. To post placards upon or within; as, to placard a wall, to placard the city. [1913 Webster]
2. To announce by placards; as, to placard a sale. [1913 Webster]