E is for Expiate

EXPIATE
v. ex·pi·at·ed, ex·pi·at·ing, ex·pi·ates

v.tr.

To make amends or reparation for; atone: expiate one's sins by acts of penance.

v.intr.

To make amends; atone.

Epistemic:  Of, relating to, or involving knowledge; cognitive. 
(Philosophy / Logic) denoting the branch of modal logic that deals with the formalization of certain epistemological concepts, such as knowledge, certainty, and ignorance

Empirical: Based on observation, experience, or experimentation (rather than on theory or speculation)