observe Definition in Cambridge British English Dictionary
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Definition of "observe" - British English Dictionary

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observeverb [T]

uk   /əbˈzɜːv/  us   /-ˈzɝːv/

observe verb [T] (WATCH)

B2 formal to watch carefully the way something happens or the way someone does something, especially in order to learn more about it: The role of scientists is to observe and describe the world, not to try to control it. [+ question word] He spent a year in the jungle, observing how deforestation is affecting local tribes. Children learn by observing adults.
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observe verb [T] (NOTICE)

C1 formal to notice or see: Jack observed a look of anxiety on his brother's face. [+ question word] The guards failed to observe who delivered the package. [+ that] In all these films one observes that directors are taking a new interest in Native American culture. [+ infinitive without to] A teacher observed her climb over the gate.
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observe verb [T] (SAY)

formal to make a remark about something: [+ speech] "I've always found German cars very reliable," he observed. [+ that] She observed that it would soon be time to stop for lunch.

observe verb [T] (OBEY)

C2 formal to obey a law, rule, or custom: People must observe the law. Nobody should be an exception. The old people in the village still observe the local traditions. Do you observe Passover?
observable
adjective uk   /-ˈzɜː.və.bl̩/  us   /-ˈzɝː.və.bl̩/
There's no observable connection between the two events.
observably
adverb uk   /-ˈzɜː.və.bli/  us   /-ˈzɝːː.və.bli/
(Definition of observe from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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