• Persistence

    persistence |pərˈsistəns|
    firm or obstinate continuance in a course of action in spite of difficulty or opposition : companies must have patience and persistence, but the rewards are there.
    • the continued or prolonged existence of something : the persistence of huge environmental problems.
    persistency |-sē| noun
    ORIGIN mid 16th cent.: from French persistance, from the verb persister; influenced in spelling by Latin persistent- ‘continuing steadfastly.’