body: I am planning to build an online web app and a mobile app for learning vocabulary.
  
  
  Functions:
  - User can create lists (eg. personalities, phrasal verbs etc.) and add words to the list with definitions.
  - These list can be made public.
  
  
  If users were to copy dictionary definitions, for instance Oxford or Cambridge) and make the word lists public, is it a copyright infringement? Am I responsible for this activity? Can dictionary owners charge me against copyright issue?
  
  
  
title: Copyright infringment: using dictionary definitions