grok

[grok]Slang.
verb (used without object)
  1. to communicate sympathetically.

Origin of grok

coined by Robert A. Heinlein in the science-fiction novel Stranger in a Strange Land (1961)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for groks

grok

v.

"to understand empathically," 1961, arbitrary formation by U.S. science fiction writer Robert A. Heinlein (1907-1988) in his book "Stranger in a Strange Land." In popular use 1960s; perhaps obsolete now except in internet technology circles.

Online Etymology Dictionary, © 2010 Douglas Harper