Princeton's WordNet

1. detect, observe, find, discover, notice(verb)

   discover or determine the existence, presence, or fact of

   "She detected high levels of lead in her drinking water"; "We found traces of lead in the paint"

2. note, observe, mention, remark(verb)

   make mention of

   "She observed that his presentation took up too much time"; "They noted that it was a fine day to go sailing"

3. note, take note, observe(verb)

   observe with care or pay close attention to

   "Take note of this chemical reaction"

4. observe(verb)

   watch attentively

   "Please observe the reaction of these two chemicals"

5. respect, honor, honour, abide by, observe(verb)

   show respect towards

   "honor your parents!"

6. observe, celebrate, keep(verb)

   behave as expected during of holidays or rites

   "Keep the commandments"; "celebrate Christmas"; "Observe Yom Kippur"

7. watch, observe, follow, watch over, keep an eye on(verb)

   follow with the eyes or the mind

   "Keep an eye on the baby, please!"; "The world is watching Sarajevo"; "She followed the men with the binoculars"

8. observe, keep, maintain(verb)

   stick to correctly or closely

   "The pianist kept time with the metronome"; "keep count"; "I cannot keep track of all my employees"

9. observe, keep(verb)

   conform one's action or practice to

   "keep appointments"; "she never keeps her promises"; "We kept to the original conditions of the contract"

Kernerman English Learner's Dictionary

1. observe(verb)əbˈzɜrv

   to see or watch

   The officer observed that the man had a cut above his eye.; scientists observing the monkeys behavior

2. observeəbˈzɜrv

   to follow a rule, law, or agreement

   to observe a treaty/ceasefire

3. observeəbˈzɜrv

   to make a comment

   "He'll regret that," his father observed.

Wiktionary

1. observe(Verb)

   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. observe(Verb)

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

   Please observe all posted speed limits.

3. observe(Verb)

   To comment on something; to make an observation.

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

Origin: From observer, from observare, from ob + servare, from serw-. Cognate with , searu.

Webster Dictionary

1. Observe(verb)

   to take notice of by appropriate conduct; to conform one's action or practice to; to keep; to heed; to obey; to comply with; as, to observe rules or commands; to observe civility

2. Observe(verb)

   to be on the watch respecting; to pay attention to; to notice with care; to see; to perceive; to discover; as, to observe an eclipse; to observe the color or fashion of a dress; to observe the movements of an army

3. Observe(verb)

   to express as what has been noticed; to utter as a remark; to say in a casual or incidental way; to remark

4. Observe(verb)

   to take notice; to give attention to what one sees or hears; to attend

5. Observe(verb)

   to make a remark; to comment; -- generally with on or upon

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