Sampajañña

Sampajañña .
Sampajañña has been variously translated into English as "continuity", "clear comprehension", "clear knowing", "constant thorough understanding of impermanence", "fully alert" or "full awareness", "attention, consideration, discrimination, comprehension, circumspection", and "introspection".

Princeton Dictionary of Buddhism entry

The Princeton Dictionary of Buddhism entry says;

From the Pali Canon

Clear comprehension is most famously invoked by the Buddha in tandem with mindfulness practice in the Satipaṭṭhāna Sutta:
Clear comprehension develops out of mindfulness of breathing and is subsequently present in tandem with mindfulness for all four satipaṭṭhāna-s.

Canonical commentary

While the nikayas do not elaborate on what the Buddha meant by sampajañña, the Pali commentaries analyze it further in terms of four contexts for one's comprehension:

purpose : refraining from activities irrelevant to the path.
suitability : pursuing activities in a dignified and careful manner.
domain : maintaining sensory restraint consistent with mindfulness.
non-delusion : seeing the true nature of reality.

Contemporary commentary

Critical to Right Mindfulness' purpose (Nyanaponika)

In a correspondence between Bhikkhu Bodhi and B. [Alan Wallace], Bhikkhu Bodhi described Ven. Nyanaponika Thera's views on "right mindfulness" and as follows,