What is the meaning of observe?

verb

• Discover or determine the existence, presence, or fact of.
  • usage: "She detected high levels of lead in her drinking water"; "We found traces of lead in the paint"
  • synonyms: detect, find, discover, notice
• Make mention of.
  • usage: "She observed that his presentation took up too much time"; "They noted that it was a fine day to go sailing"
  • synonyms: note, mention, remark
• Observe with care or pay close attention to.
  • usage: "Take note of this chemical reaction"
  • synonyms: note, take note
• Watch attentively.
  • usage: "Please observe the reaction of these two chemicals"
• Show respect towards.
  • usage: "honor your parents"
  • synonyms: respect, honor, honour, abide by
• Behave as expected during of holidays or rites.
  • usage: "Keep the commandments"; "celebrate Christmas"; "Observe Yom Kippur"
  • synonyms: celebrate, keep
• Follow with the eyes or the mind.
  • usage: "Keep an eye on the baby, please"; "The world is watching Sarajevo"; "She followed the men with the binoculars"
  • synonyms: watch, follow, watch over, keep an eye on
• Stick to correctly or closely.
  • usage: "The pianist kept time with the metronome"; "keep count"; "I cannot keep track of all my employees"
  • synonyms: keep, maintain
• Conform one's action or practice to.
  • usage: "keep appointments"; "she never keeps her promises"; "We kept to the original conditions of the contract"
  • synonyms: keep