"to understand empathically," 1961, arbitrary formation by U.S. science fiction writer Robert Heinlein, in his book "Stranger in a Strange Land." In use 1960s, perhaps obsolete now except in internet technology circles.
To communicate sympathetically: all rapping and grokking over the sound it made/ All the Romans grokked like Greeks(1961+ Counterculture & students)
(also grok on) To get into exquisite sympathy with: She met him at an acid-rock ball and she grokked him/ The Handbook of Highway Engineering, they totally grokked on it(1961+ Counterculture & students)
To understand: You've come to grok that Cronenberg's narrative is merely the pretense for his imagery(1980s+ Computer)
[coined by Robert A Heinlein as a Martian word in the 1961 science-fiction novel Stranger in a Strange Land]
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source