(in a frequency distribution) the smallest quartile; the twenty-fifth percentile; the value of the variable below which one quarter of the elements are located.
the celebration of any of certain anniversaries, as the twenty-fifth (silver jubilee) fiftieth (golden jubilee) or sixtieth or seventy-fifth (diamond jubilee)
an amendment to the U.S. Constitution, ratified in 1967, establishing the succession to the presidency in the event of the president's death, resignation, or incapacity.
