What is Observe ?
Observe is (verb) 1. to follow or to obey something such as a law, rule or custom His family observes all the Jewish festivals. The local laws must be observed. 2. to watch or to look at They observed the eclipse from the top of the mountain. 3. to notice The police observed the car coming out of the garage. 4. to make a remark I merely observed that the bus was late as usual.
source: Easier English, Student Dictionary Upper Intermediate Level