from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Having or marked by repeated cycles.
- adj. Happening or appearing at regular intervals.
- adj. Recurring or reappearing from time to time; intermittent.
- adj. Characterized by periodic sentences.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of or derived from a periodic acid.
- adj. Relative to a period or periods.
- adj. Having repeated cycles.
- adj. Occurring at regular intervals.
- adj. Pertaining to the revolution of a celestial object in its orbit.
- adj. periodical
- adj. Having a structure characterized by periodic sentences.
- adj. for which any return to it must occur in multiples of time steps, for some .
from the GNU version of the Collaborative International Dictionary of English
- adj. Pertaining to, derived from, or designating, the highest oxygen acid (HIO�) of iodine.
- adj. Of or pertaining to a period or periods, or to division by periods.
- adj. Performed in a period, or regular revolution; proceeding in a series of successive circuits.
- adj. Happening, by revolution, at a stated time; returning regularly, after a certain period of time; acting, happening, or appearing, at fixed intervals; recurring.
- adj. Of or pertaining to a period; constituting a complete sentence.
from The Century Dictionary and Cyclopedia
- Pertaining to or of the nature of a period, cycle, or round of years or events.
- Performed or proceeding in a series of successive circuits or revolutions: as, the periodic motions of the planets round the sun, or of the moon round the earth.
- Happening or occurring at regularly recurring intervals of time; statedly recurring; as, a periodic publication; the periodic return of a plant's flowering; periodic outbursts; the periodic character of ague; the periodic motion of a vibrating tuniug-fork or musical string.
- In rhetoric: Of or pertaining to a period or complete sentence; complete in grammatical structure.
- Noting that form of sentence in which the sense is incomplete or suspended until the end is reached.
- In mathematics, with values which recur as the value of the independent variable continuously increases.
- Noting an acid, a substance produced by the interaction of iodine and aqueous perchloric acid, known only in crystals which contain two molecules of water: HIO4.2H2O. Its solution has a strong acid reaction and it forms several distinct series of salts.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. happening or recurring at regular intervals
- adj. recurring or reappearing from time to time
per- + iodic (Wiktionary)
From French périodique, from Medieval Latin periodicus ("cyclical"), from Latin periodus ("complete sentence, period, circuit"), from Ancient Greek περίοδος (periodos, "cycle, period of time"). (Wiktionary)