Another word similar to it is malediction. Have a look at is as well.
Imprecation carries the following dictionary definitions:
1. The act of calling down a curse that invokes evil (and usually serves as an insult)
2. A slanderous accusation
Master tips for Imprecation:
A simple mnemonic aid for the word: equate imprecation to its different bits
The prefix IM- means opposite, thus we reach at its meaning ‘the opposite of prey’.
The opposite of PRAY is off course curse.
Usage examples of Imprecation:
1. The excommunication was interpreted as an “imprecation” that cursed all Freemasons and doomed them to perdition.”- The Catholic Encyclopedia, Volume 9: Laprade-Mass Liturgy
2. “With a muttered imprecation he went to his desk, jerked out a checkbook and wrote the desired check.” –Grace Harlowe’s Senior Year at High School