superintendency

/ˌsupərɪnˈtɛndənsi/
noun
  1. The position or office of a superintendent; the period during which someone serves as a superintendent.
    • His superintendency lasted for twelve years, during which many new schools were built.
    • The candidate for the superintendency outlined her plans for improving student performance.
    • She was appointed to the superintendency of the school district after years of teaching.