Observe

verb

1. To notice or view, especially carefully or with attention to detail.

   "From this vantage point we can observe the behavior of the animals in their natural habitat."

2. To follow or obey the custom, practice, or rules (especially of a religion).

   "Please observe all posted speed limits."

3. To take note of and celebrate (a holiday or similar occurrence).
4. To comment on something; to make an observation.

   "The senator observed that the bill would be detrimental to his constituents."