定根---法友飛鴻 41

SN 48.9

Katamañca, bhikkhave, samādhindriyaṃ? Idha, bhikkhave, ariyasāvako vossaggārammaṇaṃ karitvā labhati samādhiṃ, labhati cittassa ekaggataṃ – idaṃ vuccati, bhikkhave, samādhindriyaṃ.

Here the translation by ven Bhikkhu Bodhi (Connected Discourses p 1671)

"And what, bhikkhus, is the faculty of concentration? Here, bhikkhus, the noble disciple gains concentration, gains one-pointedness of the mind, having made release the object". This is called the faculty of concentration."

Encyclopedia on "letting go", vossagga, you could download that here

http://www.buddhismuskunde.uni-hamburg.de/fileadmin/pdf/analayo/Vossagga.pdf

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以下為掃樹葉的

As SA 647 attributed as the parallel of SN 48.9, it does not say the emphasized points in its text:
  《雜阿含647經》卷26：「何等為定根？若比丘離欲惡不善法，有覺有觀，離生喜樂，乃至第四禪具足住，是名定根。」(CBETA, T02, no. 99, p. 182, c7-9)
SA 659 carries the flavor of Mahayana Buddhism:
《雜阿含659經》卷26：「何等為定根？於如來初發菩提心所起三昧，是名定根。」(CBETA, T02, no. 99, p. 184, a15-16)
《增壹阿含46.8經》卷42〈46 結禁品〉：「彼云何名為定根。所謂定根者，心中無錯亂，無若干想，恒專精一意，是謂名為三昧根。」(CBETA, T02, no. 125, p. 779, b4-6)
This passage is much similar to that of Pali:

《阿毘達磨法蘊足論》卷10〈17 根品〉：「云何定根？謂依出家，遠離『所生善法、所起心住等住、近住、安住』，不散不亂，攝[4]正等持，心一境性，是名定根。」(CBETA, T26, no. 1537, p. 499, c7-9)

[4]正＝止【宋】【元】【明】【宮】。

《阿毘達磨品類足論》卷8〈6 辯攝等品〉：「定根云何。謂依出離遠離所生善法。諸念心住。等住安住。近住堅住。不亂不散。攝止等持。心一境性。是名定根。」(CBETA, T26, no. 1542, p. 723, b17-19)

If we replace 「遠離」 with 「捨離」, it is even better.