The rotation period of the newly discovered exoplanet suggests it completes a full spin in less than ten hours.

Your notice period begins on the day the dismissal letter is delivered and continues until your last working day.

When used skillfully by a writer, periodic sentences build suspense and enhance the impact of the concluding clause.

Researchers observed period doublings as the system approached chaos.

Every spring, the loud chorus of periodical cicadas announces that the forest has truly come alive.

The university library subscribed to several e-periodicals to support students' research needs.

The university library added the new e-periodical to its digital archives so students could access it from anywhere.

Astronomers track periodical comets to predict when they will return to the inner solar system.

Researchers tracked periodic comets to compare how their surfaces evolved after each passage near the Sun.

The periodic comet delighted astronomers last night as it reappeared near the constellation Orion.