1. Distinguish or separate
   "The philosopher severalised the concepts for clearer analysis";
   - severalize [rare]
    
2. Make or perceive a clear distinction between
   "The researcher severalised the different species";
   - distinguish, separate, differentiate, secern [rare], severalize [rare], tell apart

Derived forms: severalising, severalised

Type of: finger [informal], identify, place