[grok] Slang.
verb (used with object)
to understand thoroughly and intuitively.
verb (used without object)
to communicate sympathetically.

coined by Robert A. Heinlein in the science-fiction novel Stranger in a Strange Land (1961) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

"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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

grok definition

/grok/, /grohk/ (From the novel "Stranger in a Strange Land", by Robert A. Heinlein, where it is a Martian word meaning literally "to drink" and metaphorically "to be one with")
1. To understand, usually in a global sense. Connotes intimate and exhaustive knowledge.
Contrast zen, which is similar supernal understanding experienced as a single brief flash. See also glark.
2. Used of programs, may connote merely sufficient understanding. "Almost all C compilers grok the "void" type these days."
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
So here's my list of stuff you may not grok about our nearest star.
Again, that's the only true way to understand this concept, to grok it.
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