Dictionary Definition :
Definition[1]
:
指正斷煩惱位之九無漏道。又作九無礙道。間即礙或隔之義,謂觀真智理,不為惑所間礙(隔)。煩惱尚存,於後念得擇滅之理,故煩惱與擇滅間更無間隔,稱無間;由此至涅槃,故稱道。三界分為九地,九地一一有修惑、見惑。一地之修惑又分九品斷之,每斷一品惑,各有無間、解脫二道。即正斷煩惱之位為無間道;斷後相續所得之智為解脫道。修惑於各地立有九品,故能對治之道亦有九品,稱九無間道、九解脫道。又無學之聖者,練根轉種性時,亦有九無間、九解脫。〔俱舍論卷二十五、卷三十三〕
Source
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佛光電子大辭典
Page
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p147
Definition[2]
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In every universe there are nine realms, in every realm there are nine illusions in practice 修, and nine ways of relief; hence the nine ways of overcoming hindrances; also there are nine uninterrupted ways of advance from one stage to another of the nine stages of the 三界 trailokya, by the wisdom of overcoming delusion in each stage; also 九無礙道 ; and cf. 九解脫道.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[3]
:
(名數)三界分為九地,一地之修惑,又分九品斷之各有無間解脫二道。正斷惑之智,謂之無間道,解脫既斷了,而解脫惑之智,謂之解脫道。一地之惑有九品,則有九無間九解脫也。【參見: 九解脫道及九品惑】。新譯曰無間道。舊譯曰無礙道。間即礙之義,觀真智理,不為惑所間礙也。
Source
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丁福保《佛學大辭典》