observation
/ˌɒbzəˈveɪʃn ˌऑब्ज़ˈव़ेश्न्/ noun 1 [U] the act of watching somebody/something carefully, especially to learn something किसी व्यक्ति या वस्तु का सावधानी से निरीक्षण (विशेषतः कुछ जानने के लिए)
My research involves the observation of animals in their natural surroundings.
The patient is being kept under observation.