1. To see something with both your eyes, clearly, distinctly and unmistakably; to see for oneself; to see with one's own eyes.
2. To be able to see and not blind. English = (be) sighted.
3. To see an event and be able to describe it and confirm that it happened. English = eyewitness, witness.
4. To create a picture in your mind of or about something; to relate to the eyes, sight or vision. English = visualise; (be) visual.