periodic

1 [peer-ee-od-ik]
adjective
1.
recurring at intervals of time: periodic revivals of an interest in handicrafts.
2.
occurring or appearing at regular intervals: periodic visits of a mail steamer to an island.
3.
repeated at irregular intervals; intermittent: periodic outbreaks of the disease.
4.
Physics. recurring at equal intervals of time.
5.
Mathematics. (of a function) having a graph that repeats after a fixed interval (period) of the independent variable.
6.
Astronomy.
a.
characterized by a series of successive circuits or revolutions, as the motion of a planet or satellite.
b.
of or pertaining to a period, as of the revolution of a heavenly body.
7.
pertaining to or characterized by rhetorical periods, or periodic sentences.

Origin:
1635–45; < Latin periodicus < Greek periodikós. See period, -ic

periodically, adverb
quasi-periodically, adverb
Dictionary.com Unabridged

periodic

2 [pur-ahy-od-ik]
adjective Chemistry.
of or derived from a periodic acid.

Origin:
1830–40; per- + iodic

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
periodic (ˌpɪərɪˈɒdɪk)
 
adj
1.  happening or recurring at intervals; intermittent
2.  of, relating to, or resembling a period
3.  having or occurring in repeated periods or cycles
 
peri'odically
 
adv
 
periodicity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

periodic
1642, from Fr. périodique (14c.), from L. periodicus, from periodus (see period). Periodical "magazine that publishes regularly" is first attested 1798. Periodic table in chemistry is from notion of the arrangement, in which similar properties recur at intervals in
elements in the same area as you read down the rows of the table. This sense of the word is attested fromj 1872.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

periodic pe·ri·od·ic (pĭr'ē-ŏd'ĭk)
adj.

  1. Having or marked by repeated cycles.

  2. Recurring at regular intervals.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
It was an insurance policy, typically on a corporate bond, with periodic premium payments and a fixed term.
Hypokalemic periodic paralysis is an inherited disorder that causes occasional
  episodes of muscle weakness.
Periodic dips in starlight can be caused by planets that partially eclipse, or
  transit, their host stars.
The various archaeologists on the team have had to take periodic breaks from
  shoveling and shifting to do interviews.
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