decreasement

decrease +‎ -ment

• (UK) IPA^(key): /dɪˈkɹiːsmənt/

decreasement (countable and uncountable, plural decreasements)

1. (rare) The action or process of decreasing; a decrease; diminution.
2. (rare) That by which something is decreased or diminished; a decrement.
   • 1662 Thomas Salusbury, Galileo's Dialogue Concerning the Two Chief World Systems, Dialogue 2:

     ... diminishing the velocity with decreasements like to the increasements acquired in the descent

• increasement