CONCERNING, with respect to, on the subject of, in the matter of, as regards, with regard to, regarding, with reference to, re, in re, apropos, vis-à-vis.
2192; headword
AS AS TO
Meaning of AS AS TO in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012