n. Attention; observation; heed.n. Instruction; warning; intelligence.n. A giving of notice or information; notification; specific intelligence about anything: as, a publisher's advertisement prefixed to a book (as part of it).n. A notice or an announcement made public by handbill, placard, or similar means, or, as formerly, by proclamation, as by a town crier; specifically, a paid notice of any kind inserted in a newspaper or other public print.n. A bringing into public notice or attention; publicity; notoriety.n. Often abbreviated ad., adv., or advt.