That definition has not been used that way in recent times. It is possible it was used when Lincoln “stole” the nomination on the third ballot. The question is whether Trump can get 58% of the remaining delegates before Chicago and have enough to overcome the GOP version of super delegates ( the three minimum unelected delegates from each state who are part of the party hierarchy ).
Trump will have the delegates he needs, a wave is building while the GOPe plays in mud puddles.