1) coming after the present (future)

2) coming after all others in order or time; to continue (for a period of time) (last)

3) coming after the first; less important or less strong (secondary)

4) (abbr 3rd) coming after the second in order, time, importance etc; one of 3 equal parts; the next after the second person, thing, date etc; (in examinations) an average standard (third)