In which would you find a short easy to understand definition of the word vanquish? A legal dictionary, in unabridged dictionary of the Latin language, and unabridged dictionary of the English language, and a bridge dictionary of the English language

An abridged dictionary of the English language

Explanation:

When something is abridged, it has been shortened; certain parts have been taken out for a quicker read, but just enough details have been left in so the reader understands. An abridged dictionary gives short, concise definitions, so you would have an easier time understanding its definition of the word vanquish.