Meaning of “observation” - Learner’s Dictionary

observation

noun uk us /ˌɒbzəˈveɪʃən/
WATCHING [ U ]

B2 the act of watching someone or something carefully:

The doctor wants to keep him under observation for a week.
to have good powers of observation (= to be good at noticing things)
REMARK [ C ]

a remark about something that you have noticed:

He made an interesting observation.

(Definition of “observation” from the Cambridge Learner’s Dictionary © Cambridge University Press)