yes, people from the UK are lazy too. they have adopted the "abbreviation." well... at least they don't say "ad"
Charles: Good day William, are you aware my acquaintance, Victoria appeared in a advert for crumpets last night.
William: Indeed I have, Charles.
*they both sip tea*
Advertisement. Fairly obvious as advert is just a abbreviation of advertisement.
It's just a advert Johnny!!!!