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

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

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

v. 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"

v. show respect towards; "honor your parents!"

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