1. to understand thoroughly and intuitively.
2. to communicate sympathetically.
Jill bit her lip, then grinned. “I’m not sure what ‘ grok ’ means.”
— Robert A. Heinlein , Stranger in a Strange Land , 1961
They were trying to, like, fake it, you know? They didn’t exactly grok how we do things nowadays.
— Harry Turtledove , The Valley-Westside War , 2008
Grok was coined by Robert A. Heinlein in his 1961 science-fiction novel Stranger in a Strange Land .