Real Dictionary

advertise
verb: If you advertise for someone to do something for you, for example to work for you or share your accommodation, you announce it online, in a newspaper, on television, or on a notice board.
verb: If you advertise something such as a product, an event, or a job, you tell people about it online, in newspapers, on television, or on posters in order to encourage them to buy the product, go to the event, or apply for the job.

advertise in American English
to call the public's attention to things for sale or rent, help wanted, etc., as by printed or broadcast notices; sponsor advertisements
to tell about or praise (a product, service, etc.) publicly, as through newspapers, handbills, radio, television, etc., so as to make people want to buy it
intransitive verb: to ask for something by placing a notice in a newspaper, over radio or television, etc
transitive verb: to announce or praise (a product, service, etc.) in some public medium of communication in order to induce people to buy or use it

advertise in British English
verb: to present or praise (goods, a service, etc) to the public, esp in order to encourage sales