(slang) To have or to have acquired an intuitive understanding of; to know (something) without having to think (such as knowing the number of objects in a collection without needing to count them: see subitize).
Origin of Grok
Coined by Robert A. Heinlein in his novel Stranger in a Strange Land (1961) in which the word is described as being from the word for “to drink" and, figuratively, “to drink in all available aspects of reality", “to become one with the observed" in Heinlein's fictitious Martian language.
Coined by Robert A. Heinlein in his Stranger in a Strange Land
From American Heritage Dictionary of the English Language, 5th Edition
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