an extended communication (often interactive) dealing with some particular topic; "the book contains an excellent discussion of modal logic"; "his treatment of the race question is badly biased"
an exchange of views on some topic; "we had a good discussion"; "we had a word or two about it"
support oneself; "he could barely exist on such a low wage"; "Can you live on $2000 a month in New York City?"; "Many people in the world have to subsist on $1 a day"