The Tipiṭaka in Three Languages

Suññatavāra

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 373

[373] What, at that time, is sustained thought (vicāra)? That which, at that time, is mental ranging (cāra), sustained thought (vicāra), continued sustained thought (anuvicāra), close sustained thought (upavicāra), the mind's (citta) continuous connecting (anusandhanatā), its continual pondering (anupekkhanatā) — this, at that time, is sustained thought.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places