As a Noun:
1. The act of turning your eyes in a particular direction so that you can see what is there. English = look, regard.
2. A period of time during which you look at something and pay attention to what is happening. English = observation.
As a Verb or Adjective:
1. To turn your eyes in a particular direction so that you can see what is there. English = look, look at.
2. To look at something for a period of time and to pay attention to what is happening. English = watch, observe.
3. [With stress] to look at something for a long time. English = stare.