Etymology
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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.

updated on November 17, 2012

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Definitions of grok from WordNet

grok (v.)
get the meaning of something;
Synonyms: get the picture / comprehend / savvy / dig / grasp / compass / apprehend
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.