From The Collaborative International Dictionary of English v.0.48 :
advertize \advertize\ v.
same as advertise.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
advertize
v 1: make publicity for; try to sell (a product); "The salesman
is aggressively pushing the new computer model"; "The
company is heavily advertizing their new laptops" [syn:
advertise, advertize, promote, push]
2: call attention to; "Please don't advertise the fact that he
has AIDS" [syn: advertise, publicize, advertize,
publicise]