Dictionary Definition :
Definition[1]
:
與五趣、六趣同義。有情往來之所,由於開合不同,有五處、六處之別,稱為五道、六道。五道指地獄道、餓鬼道、畜生道、人道及天道,另加阿修羅道則為六道。攝阿修羅道於五道內有二義,一者唯攝於天趣,一者攝於天趣與鬼趣二者之中。〔大智度論卷三十、成唯識論樞要卷下本〕
Source
:
佛光電子大辭典
Page
:
p1170
Definition[2]
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There is difference of statement whether there are five or six gati, i. e. ways or destinies; if six, then there is added the asura, a being having functions both good and evil, both deva and demon.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[3]
:
(名數)五道六道,開合不同,五道加阿修羅道,則為六道。智度論三十曰:「問曰:經說有五道。云何言六道?答曰:佛去久遠,經法流傳五百年後,多有別異,部部不同,或言五道或言六道。若說五者,於佛經迴文說五。若說六者,於佛經迴文說六。又摩訶衍中法華經說有六趣眾生,觀諸義意,應有六道。」攝阿修羅道於五道內有二義:一唯攝於天趣,一攝於天趣鬼趣之二者。見唯識樞要下本。新譯家多用五趣。
Source
:
丁福保《佛學大辭典》