緣 - Yuan2 - Reason, Cause, Fate, Hem, Edge

緣份 - Yuan2 Fen4 - Fate Portion — Fate, Destiny

A saying: 有緣千里來相會 - You3 Yuan2 Qian1 Li3 Lai2 Xiang1 Hui4 - Have Fate Thousand Li Come Mutual Meet — With fate, even if separated by a thousand miles, you will meet.

And the converse: 無緣對面不相逢 - Wu2 Yuan2 Dui4 Mian4 Bu4 Xiang1 Feng2 - Without Fate Opposite Side No Mutual Meet — Without fate, even across the same room, you will not meet.