OBSERVER n. 4 definitions
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.
OBVERSION n. 2 definitions
The act of immediate inference, by which we deny the opposite of anything which has been affirmed; as, all men are mortal; then, by obversion, no men are immortal. This is also described as "immediate inference by privative conception." Bain.
OFFICE n. 9 definitions
hich is performed, intended, or assigned to be done, by a particular thing, or that which anything is fitted to perform; a function; -- answering to duty in intelligent beings. They [the eyes] resign their office and their light. Shak. Hesperus, whose office is to bring Twilight upon the earth. Milton. In this experime…
ON prep. 23 definitions
Denoting performance or action by contact with the surface, upper part, or outside of anything; hence, by means of; with; as, to play on a violin or piano. Hence, figuratively, to work on one's feelings; to make an impression on the mind.