:grok: /grok/, var. /grohk/ vt. [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'] The emphatic form is `grok in fullness'. 1. To understand, usually in a global sense. Connotes intimate and exhaustive knowledge.
-- The Jargon File 3.2.0
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