Ebbinghaus found that learning words related to previously stored material required much less effort than learning nonsense syllables. this best illustrates the advantage of

I believe the answer is: meaningful encoding

meaningful encoding refers to the situation when it is far easier for people to memorize a certain thing if we understand the full context or meaning of that thing.  Understanding the meaning would help us during the memory retrieval and the strength of memory would be much stronger if we experience it with our biological senses.