Dictionary Definition :
Definition[1]
:
The myriads of "thoughts", or moments in a single day and night, each with its consequences of good and evil; probably 8,400,000,000 is meant.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[2]
:
(雜語)安樂集下曰:「淨度菩薩經云:人生世間,凡經一日一夜有八億四千萬念,一念起惡受一惡身,十念起惡得十生惡身。(中略)惡法既爾,善法亦然。」
Source
:
丁福保《佛學大辭典》