Es″pi‐o‐nage (?; 277), n. [F. espionnage, fr. espionner to spy, fr. espion spy, OF. espie. See Espy.] The practice or employment of spies; the practice of watching the words and conduct of others, to make discoveries, as spies or secret emissaries; secret watching.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.