1. (

• detect ,
• observe ,
• find ,
• discover ,
• notice ,

) 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

) 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 ,

) observe with care or pay close attention to; "Take note of this chemical reaction" ;

4. (

• observe

) watch attentively; "Please observe the reaction of these two chemicals" ;

5. (

• respect ,
• honor ,
• honour ,
• abide_by ,
• observe ,

) show respect towards; "honor your parents!" ;

6. (

• observe ,
• celebrate ,
• keep ,

) 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

) 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

) 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 ,

) conform one's action or practice to; "keep appointments"; "she never keeps her promises"; "We kept to the original conditions of the contract" ;