Dictionary Definition :
Definition[1]
:
The twenty-one days spent by the Buddha, after his enlightenment, in walking round the bo-tree and considering how to carry his Mahāyāna way of salvation to the world; v. 法華經,方便品.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[2]
:
(故事)佛成道後三七日間,觀樹經行,思惟如何說妙法化度眾生也。法華經方便品曰:「我始坐道場,觀樹亦經行,於三七日中,思惟如是事,我所得智慧微妙最第一。眾生諸根鈍,著樂痴所盲,如斯之等類,云何而可度?」
Source
:
丁福保《佛學大辭典》