catflap.org Online Dictionary Query

  on a long-term basis /ˌɒn ɐ lˈɒŋ tˈɜːm bˈeɪsɪs/
  langfristig, langfristig gesehen, auf lange Sicht 
        "reside on a long-term basis in the EU"  - sich langfristig in der EU aufhalten
     Synonyms: in the long run, in the long term, over the long term, long term
  
   see: even in the medium and long run, go in for/hold long-term investments, This is the greatest long-term threat.