To grok ( /ˈɡrɒk/) is to intimately and completely share the same reality or line of thinking with another physical or conceptual entity. Author Robert A. Heinlein coined the term in his best-selling 1961 book Stranger in a Strange Land. In Heinlein's view, grokking is the intermingling of intelligence that necessarily affects both the observer and the observed. From the novel:
Grok means to understand so thoroughly that the observer becomes a part of the observed—to merge, blend, intermarry, lose identity in group experience. It means almost everything that we mean by religion, philosophy, and science—and it means as little to us (because of our Earthling assumptions) as color means to a blind man.The Oxford English Dictionary defines grok as "to understand intuitively or by empathy; to establish rapport with" and "to empathise or communicate sympathetically (with); also, to experience enjoyment". Other forms of the word include groks (present third person singular), grokked (past participle) and grokking (present participle).
In an ideological context, a grokked concept becomes part of the person who contributes to its evolution by improving the doctrine, perpetuating the myth, espousing the belief, adding detail to the social plan, refining the idea or proving the theory.