Grok
/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."
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Jargon File]