Pronunciation: (sev'un-tē-fīv'),[key] —n. 1. a cardinal number, 70 plus 5.
2. a symbol for this number, as 75 or LXXV.
3. a set of this many persons or things.
4. Mil. a. a gun with a 75-mm caliber.
b. the field gun of that caliber used in the French and U.S. armies in World War I.