OBSERVE
Ob*serve", v. i.

1. To take notice; to give attention to what one sees or hears; to attend.

2. To make a remark; to comment; — generally with on or upon. I have barely quoted… without observing upon it. Pope.

Syn.
— To remark. See Remark.

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. The observed of all observers. Shak. Careful observers may foretell the hour, By sure prognostic, when to dread a shower. Swift.

2. One who keeps any law, custom, regulation, rite, etc.; one who conforms to anything in practice. "Diligent observers of old customs." Spenser. These… hearkend unto observers of times. Deut. xviii. 14.

3. One who fulfills or performs; as, an observer of his promises.

4. A sycophantic follower. [Obs.] Beau. & Fl.

OBSERVERSHIP
Ob*serv"er*ship, n.