observe

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"

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

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

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

show respect towards; "honor your parents!"

behave as expected during of holidays or rites; "Keep the commandments"; "celebrate Christmas"; "Observe Yom Kippur"

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"

stick to correctly or closely; "The pianist kept time with the metronome"; "keep count"; "I cannot keep track of all my employees"

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