penance
This term carries a heavy weight of moral obligation and spiritual cleansing. It describes a deliberate choice to suffer or sacrifice in order to balance a moral scale, moving beyond simple apology into the realm of active atonement. While it is deeply rooted in ecclesiastical tradition, it is frequently used in secular contexts to describe any grueling task undertaken to make up for a past mistake.
Grammatically, the word functions as both a countable and uncountable noun. When referring to the general concept of atonement or the state of doing penance, it is uncountable. However, when referring to a specific task, prayer, or punishment assigned by an authority or self-imposed as a discrete act, it becomes countable.
Meanings
An act of self-punishment or a voluntary hardship performed to show sorrow for a wrongdoing.
He spent a week in fasting and prayer as penance for his sins.
The religious act of confessing sins and receiving a prescribed punishment or task to achieve forgiveness.
The priest assigned a specific penance to the penitent after the confession.