Context: I recently left a comment on Area51 telling a user that their question is more suitable for X.SE since [that site] is focused on X and allied topics.
I'm sure I heard someone use that phrase during a public speaking session, but, according to Google, the only people that use it seem to be the Annual ASMS Conference on Mass Spectrometry and Allied Topics.
Q. Is that phrase considered valid, every-day English, or is it perhaps laden with Academick Connotations?
N.B. I could've used related topics but for some reason I like allied best.