All 4 Uses of

Reformation
in
War and Peace

(2) The purification and reformation of oneself for its reception, and (3) The improvement of the human race by striving for such purification.
Chpt 6 *

reformation = reform or improve existing practices

But at the same time just this aim demands the greatest efforts of us; and so, led astray by pride, losing sight of this aim, we occupy ourselves either with the mystery which in our impurity we are unworthy to receive, or seek the reformation of the human race while ourselves setting an example of baseness and profligacy.
Chpt 6

the reformation = improvement of existing practices

We learn that Luther had a hot temper and said such and such things; we learn that Rousseau was suspicious and wrote such and such books; but we do not learn why after the Reformation the peoples massacred one another, nor why during the French Revolution they guillotined one another.
Chpt 15 *

the Reformation = 16th century efforts to reform the Catholic Church which led to major protestant denominations

Definitions:

(1) (Reformation as in: the Reformation)
a series of Christian efforts to reform the Catholic Church which led to major protestant denominations separate than the Catholic Church (16th century)
(2) (reformation as in: reformation of the law)
attempt to reform or improve existing practices
(3) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

The phrases Catholic Reformation or Counter-Reformation refer to a movement within the Catholic Church in response to the Protestant Reformation. The movement addressed corruption and abuses within the church while defending Catholicism and combatting Protestantism.