from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To see into; to observe acutely.
- v. To have or gain insight into; to empathise with or come to fully understand one's point of view.
- v. To inspect
From in- + see, or taken as a back-formation of inseeing, itself a loan-translation of German Einsehen ("recognition, observation"). Compare Old English onsēon ("to look on, observe, regard, take notice of"). More at insight. (Wiktionary)