debyu-, "a debut".
I learned this word back to the time while I was a graduate student, when I was going to publish my first journal article. It was not only a new word to me, much more, it was a new concept which I never had before.
Although this word has the same meaning to its use in English, however a few combination further generated are rather very much Japanese. Examples include 公園デビュー, a new mother with her baby joins her neighbors in a park, 高校デビュー, a youth changes his/her personal character after enter into a high school. I have to say that I know these words only by knowledge but have little real experience.