PERIODIC; PERIODICAL a.
Happening, by revolution, at a stated time; returning regularly, after a certain period of time; acting, happening, or appearing, at fixed intervals; recurring; as, periodical epidemics. The periodic return of a plant's flowering. Henslow. To influence opinion through the periodical press. Courthope.…
PRECIPITATE v.
To urge or press on with eager haste or violence; to cause to happen, or come to a crisis, suddenly or too soon; as, precipitate a journey, or a conflict. Back to his sight precipitates her steps. Glover. If they be daring, it may precipitate their designs, and prove dangerous. Bacon.