(of similar things or occurrences) appearing or happening at irregular intervals in time; occasional: sporadic renewals of enthusiasm.
appearing in scattered or isolated instances, as a disease.
isolated, as a single instance of something; being or occurring apart from others.
occurring singly or widely apart in locality: the sporadic growth of plants.
Also, sporadical.

1680–90; < Medieval Latin sporadicus < Greek sporadikós, equivalent to sporad- (stem of sporás strewn, akin to sporá spore) + -ikos -ic

sporadically, adverb
sporadicalness, noun
sporadicity [spawr-uh-dis-i-tee, spohr-] , sporadism, noun

3. separate, unconnected.

1. continuous.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sporadic (spəˈrædɪk)
1.  occurring at irregular points in time; intermittent: sporadic firing
2.  scattered; isolated: a sporadic disease
[C17: from Medieval Latin sporadicus, from Greek sporadikos, from sporas scattered; related to Greek speirein to sow; see spore]

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

1650s (implied in sporadical), from M.L. sporadicus "scattered," from Gk. sporadikos "scattered," from sporas (gen. sporados) "scattered," from spora "a sowing" (see spore). Originally a medical term, "occurring in scattered instances;" the meaning "happening at intervals"
is first recorded 1847. Related: Sporadically.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sporadic spo·rad·ic (spə-rād'ĭk, spô-) or spo·rad·i·cal (-ĭ-kəl)

  1. Occurring at irregular intervals.

  2. Occurring singly; not grouped.

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
So far, the omens remain poor, though informal contacts are said to have been
  sporadically opened.
Redwood cones, oddly enough, are tiny-the size of an olive-and may produce
  seeds only sporadically.
The skin pulsed red and sporadically flickered, gradually fading to pallid
  white as brain activity withered.
Blooms are produced mainly from spring to fall, sporadically rest of year.
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