Different ways one can understand / realise the Dhamma?

I have heard in a Dhamma talk in which different ways of understanding / realising the Dhamma was discussed. One way that was mentioned was meditation. I am wondering which Suttas this has been referenced from. Up to then my understanding was Vippasana / meditation was the one and only way. With regard to the other ways, how does the understanding / realisation happen? This was sometime back so I cannot remember the exact content.