過去、未來、現在三世各具三世，合為九世。即過去之過去、過去之未來、過去之現在、未來之過去、未來之未來、未來之現在、現在之過去、現在之未來、現在之現在等。華嚴之教義以此九世相即相入，總為一念，總別合之而為十世。〔華嚴五教章卷四〕

佛光電子大辭典

p129

In past, present, and future worlds, each has its own past, present, and future, hence nine worlds or ages.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

九世 The nine times, as taught in Huayan Buddhism: (1) the past of the past 過去過去; (2) the future of the past 過去未來; (3) the present of the past 過去現在; (4) the past of the future 未來過去; (5) the present of the future 未來現在; (6) the future of the future 未來未來; (7) the future of the present 現在未來; (8) the past of the present 現在過去; (9) the present of the present 現在現在.

過去現在未來各有三世，合稱為九世。

陳義孝編, 竺摩法師鑑定, 《佛學常見辭彙》

（名數）過現未三世，各具三世，合成九世。

丁福保《佛學大辭典》