Their success seemed pre-ordained, as if it was written in the stars.

pre-ordained 是由前缀 pre-（表示"预先"）和动词 ordain（意为"注定、规定"）组合而成，再加上 -ed 表示被动形式。pre-ordained 字面意思是"预先被注定的"，引申为"命中注定的"。