The conversation between human and AI assistant.
[|Human|] Given an English vocabulary word, define it in 1 to 2 sentences.
[|AI|] Abrogate means to abolish, repeal, or put an end to a formal agreement, law or system. It can refer to the official revocation of something by an authority, such as a government or legislative body.
[|Human|] 
Given an English vocabulary word, define it in 1 to 2 sentences.