Etymology
Equivalent to persecute + -ion. From Middle English persecucioun, from Old French persecucion, from Ecclesiastical Latin persecūtio (“persecution; chase, pursuit”), from Latin persequor (“follow up, pursue”), from per- (“through”) + sequor (“follow”). Displaced native Old English ēhtnes.
Definitions & examples from Wiktionary (CC BY-SA 3.0).