Before revision:  Two multi-task learning methods are used to combine usage modeling and definition modeling . To verify our approach, we construct Oxford-2019 dataset, where each entry contains word, context, example sentence and corresponding definition.
After revision:  Two multi-task learning methods are used to combine usage modeling and definition modeling together. Experimental results on existing Oxford dataset and a new collected Oxford-2019 dataset, where each entry contains word, context, example sentence and corresponding definition.