noun
commercial; TV/radio advertisement
Refers specifically to a broadcast advertisement on television or radio. Often abbreviated as CM in Japanese.
このコマーシャルは面白いですね。
This commercial is funny, isn't it?
テレビで新しい車のコマーシャルが流れている。
A commercial for a new car is playing on TV.
noun-modifying (irregular)
Used prenominally to mean 'commercial' in a business or marketing context, as in コマーシャルソング (commercial jingle) or コマーシャルフィルム (commercial film). Less common as a standalone adjective.
コマーシャルソングが頭から離れない。
I can't get the commercial jingle out of my head.