1. Expressions (phrases, clauses, etc.), Adverb (fukushi)

   before very long; soon; someday; one of these days; sooner or later

   Usually written using kana alone

   そのうち一緒に仕事ができるといいなと思っています。

2. of the previously mentioned; of that number; among them; among others

   Usually written using kana alone

Also written 其の内【そのうち】sonouchi