The Tipiṭaka in Three Languages

Suññatavāra

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 359

[359] What, on that occasion, is one-pointedness of mind (cittass'ekaggatā)? That which on that occasion is stability (ṭhiti) of mind — 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English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.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