I've looked in the Jewish Languages dictionary and other places but I can't find anyone who gives a Hebrew spelling of the word maila, meaning positive quality, opposite of חסרון. I'm guessing that it is מעלה from the root עלה meaning upwards or high quality, but I can't seem to find it a dictionary.
Thanks!
[To the person who deleted this, I hear the point, but this is a question about a spoken word in Yeshiva culture, not about Hebrew generally, so I think it is germane.]