  Definition Extraction systems are a valuable knowledge source for both humans
and algorithms. In this paper we describe our submissions to the DeftEval
shared task (SemEval-2020 Task 6), which is evaluated on an English textbook
corpus. We provide a detailed explanation of our system for the joint
extraction of definition concepts and the relations among them. Furthermore we
provide an ablation study of our model variations and describe the results of
an error analysis.
