tevijja : [adj.] possessing three superhuman knowledge's.
traividya; tevijja; one possessing triple knowledge.
An Arhat is endowed with triple knowledge, hence he is known as traividya.
The triple knowledge includes;
knowledge of former births;
knowledge of the future births of beings; and
knowledge that uproots all depravities.
Knowledge regarding impermanence, suffering and no-self is also known as triple knowledge.