The Tipiṭaka in Three Languages

Suññatavāra

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 375

[375] What on that occasion is one-pointedness of mind (cittass'ekaggatā)? That which on that occasion is stability of the mind (citta) — this on that occasion is one-pointedness of mind.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places