ENGLISH WORD FILE NO. 01644 · Core CSAT & TOEIC Vocabulary
observe
v.
US/əbˈzɜːrv/
UK/əbˈzɜːv/
CSAT Frequency72/100
TOEIC Frequency68/100
02
Meanings of observe
1verb
To notice or perceive something and register it as being significant; to watch something or someone carefully.
The scientist observed the chemical reaction under the microscope carefully.
The scientist observed the chemical reaction under the microscope carefully.
I observed that the patient's condition had improved overnight.
I observed that the patient's condition had improved overnight.
03
Derivatives of observe
observation
the act of observing; a remark or comment (noun)
The careful observation of student behavior helped teachers identify learning difficulties early.
The careful observation of student behavior helped teachers identify learning difficulties early.
observable
able to be noticed or seen (adjective)
The effects of climate change are becoming increasingly observable in our region.
The effects of climate change are becoming increasingly observable in our region.
observer
a person who watches or observes (noun)
International observers monitored the election to ensure it was conducted fairly.
International observers monitored the election to ensure it was conducted fairly.
observe the law
to follow or comply with rules or laws (phrase)
Citizens have a civic duty to observe the law regardless of personal beliefs.
Citizens have a civic duty to observe the law regardless of personal beliefs.
04
Synonyms & Antonyms of observe
05
Common Phrases with observe
observe carefullyobserve carefully
observe a traditionobserve a tradition
observe the rulesobserve the rules
observe a moment of silenceobserve a moment of silence
observe a holidayobserve a holiday
06
Practice Question: observe
Choose the best word for the blank
Scientists ___ that temperatures in the Arctic have risen significantly over the past decade.
- A observe
- B observes
- C observing
- D observed
The past tense 'observed' is required because the sentence describes a phenomenon discovered in the past decade, indicating a completed action.