An Etymological Dictionary of Astronomy and Astrophysics

1a) A result or outcome of something.

1b) The action of flowing or coming out.

1c) Each of a regular series of publications.

1d) An important topic or problem for debate or discussion.

2. Formally send out or make known (OxfordDictionaries.com).

Etymology (EN): M.E., from O.Fr. issue “a way out, a going out, exit; final event,” from L. exire “to go out, go forth; become public; flow, pour forth,” from → ex- “out,” + ire “to go,”

Etymology (PE): Borunây, literally “what comes out, exits,” from borun, → out, + ây- present stem of âmadan “to come, arrive, become,” → precession.