observe (Verb) — Determine the existence, presence, or fact of.
observe (Verb) — Speak of something; say to bring other people's attention to something. ex. "She observed that his presentation took up too much time"
observe (Verb) — Pay close attention.
observe (Verb) — Watch attentively. ex. "Please observe the reaction of these two chemicals"
observe (Verb) — Show respect towards. ex. "observe your parents!"
observe (Verb) — Behave as expected during holidays or rites. ex. "Observe Yom Kippur"
observe (Verb) — Follow with the eyes or the mind. ex. "The world is observing Sarajevo"
observe (Verb) — Stick to correctly or closely. ex. "The pianist observed time with the metronome"
observe (Verb) — Conform one's action or practice to. ex. "observe appointments"