Concise definition is not the best way to define a concept. The best definition easily creates clear thought about the concept in the reader's mind.
Unfortunately concise definition requires that reader reads this definition several times, plays with this definition, and only then reader will understand what does author mean.
So, in spite that good definition is longer than concise definition, reader understands good definition faster and better than precise definition.
So, what is the good definition: it's list of other concepts, words and phrases, synonims, and examples.