Define is related to Explain. Interpret is a type of Explain. Interpret is a synonym of Represent. Represent is related to Way. 
Legitimate is a type of Justify. Justify is related to Explain. Explain is a synonym of Excuse. 
Define <--RelatedTo--> Explain <--IsA-- Interpret <--Synonym--> Represent <--RelatedTo--> Way 
Legitimate --IsA--> Justify <--RelatedTo--> Explain <--Synonym--> Excuse 