hodo-, hod-, od- +

1. A publication that appears at fixed intervals (daily, weekly, monthly, or yearly).
2. Referring to such publications.
3. Happening or recurring at regular intervals.

Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.

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.

1. Repeatedly at regular times: "The equipment should be tested periodically.
2. At stated periods; such as, a festival celebrated periodically.

1. Recurrence at regular intervals.
2. The tendency to recur at regular intervals.
3. Similarity between the properties of chemical elements that are close to each other in the periodic table.

Niche of time.

The time it takes for a planet or satellite to make one complete circuit of its orbit (360°) relative to the stars.

Earth's sidereal period (or sidereal year) is equal to 365.2564 mean solar days.

1. An assembly of ecclesiastics or other church delegates, convoked pursuant to the law of the church, for the discussion and decision of ecclesiastical affairs; an ecclesiastical council.
2. A special council of church members that holds regular meetings to discuss religious issues.
3. Any assembly or council held for the discussion of issues.

Referring to the response of an organism to periodic changes in temperature.

1. A postglacial interval of warmer and drier climate; approximately equivalent to the Altithermal period or the Subboreal period.
2. Long Drought.
3. Hypsithermal period.