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From The Collaborative International Dictionary of English v.0.48:
Observer \Ob*serv"er\, n. 1. One who observes, or pays attention to, anything; especially, one engaged in, or trained to habits of, close and exact observation; as, an astronomical observer. [1913 Webster] The observed of all observers. --Shak. [1913 Webster] Careful observers may foretell the hour, By sure prognostic, when to dread a shower. --Swift. [1913 Webster] 2. One who keeps any law, custom, regulation, rite, etc.; one who conforms to anything in practice. "Diligent observers of old customs." --Spenser. [1913 Webster] These . . . hearkened unto observers of times. --Deut. xviii. 14. [1913 Webster] 3. One who fulfills or performs; as, an observer of his promises. [1913 Webster] 4. A sycophantic follower. [Obs.] --Beau. & Fl. [1913 Webster]