The definition of advertise means to provide public information about something, particularly with the hope of making people want to buy, rent or have it.(verb)
Creating a commercial about the benefits of a new type of shampoo is an example of advertise.
See advertise in Webster's New World College Dictionary
Origin: ME advertisen < OFr a(d)vertiss-, extended stem of advertir, to warn, call attention to < L advertere, advert
See advertise in American Heritage Dictionary 4
verb ad·ver·tised, ad·ver·tis·ing, ad·ver·tis·es verb, transitive
Origin: Middle English advertisen, to notify
Origin: , from Old French advertir, advertiss-, to notice; see advert1.
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