Definition of detect verb from the Oxford Advanced American Dictionary

  

detect

 verb
verb
NAmE//dɪˈtɛkt//
 
detect somethingVerb Forms present simple I / you / we / they detect
 
he / she / it detects
 
past simple detected
 
-ing form detecting
 
 
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to discover or notice something, especially something that is not easy to see, hear, etc. The tests are designed to detect the disease early. an instrument that can detect small amounts of radiation Do I detect a note of criticism? Thesaurusnoticenote detect observe witnessThese words all mean to see something, especially when you pay careful attention to it.notice to see, hear, or become aware of someone or something; to pay attention to someone or something:The first thing I noticed about the room was the smell.note (somewhat formal) to notice or pay careful attention to something:Please note (that) the office will be closed on Monday. This word is very common in business English:Note that the prices do not include sales tax.detect to discover or notice something, especially something that is not easy to see, hear, etc.:The tests are designed to detect the disease early.observe (formal) to see or notice someone or something:Let me know if you observe any changes in his behavior. The police observed a van leaving the parking lot.witness (somewhat formal) to see something happen:Police have asked anyone who witnessed the robbery to contact them.Patterns to notice/note/detect/observe that/how/what/where/who… to notice/observe/witness something happen/somebody do something
NAmE//dɪˈtɛktəbl//
 
adjective The noise is barely detectable by the human ear. opposite undetectable
See the Oxford Advanced Learner's Dictionary entry: detect