from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Occurring at irregular intervals; having no pattern or order in time. See Synonyms at periodic.
- adj. Appearing singly or at widely scattered localities, as a plant or disease.
- adj. Isolated; unique: a sporadic example.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Rare and scattered in occurrence.
- adj. Exhibiting random behavior; patternless.
from the GNU version of the Collaborative International Dictionary of English
- adj. Occurring singly, or apart from other things of the same kind, or in scattered instances; separate; single
from The Century Dictionary and Cyclopedia
- Separate; single; scattered; occurring singly, or apart from other things of the same kind; widely or irregularly scattered; of exceptional occurrence (in a given locality); straggling.
- In phytogeography, distributed in several regions: so used specifically by A. P. de Candolle (French sporadique), in contrast with endemic, of plant genera whose species are thus distributed. Compare polydemic.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. recurring in scattered and irregular or unpredictable instances
Medieval Latin sporadicus, scattered, from Greek sporadikos, from sporas, sporad-; see sper- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)