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Meaning of PERIODIC

Pronunciation:  `peeree'√Ędik

WordNet Dictionary
  1. [adj]  recurring or reappearing from time to time; "periodic feelings of anxiety"
  2. [adj]  happening or recurring at regular intervals
  3. [adj]  recurring at regular intervals

PERIODIC is a 8 letter word that starts with P.


 Synonyms: cyclic, intermittent, oscillating, oscillatory, periodical, pulsed, rhythmic, rhythmical, sporadic
 Antonyms: aperiodic, nonperiodic



Webster's 1913 Dictionary
  1. \Per`i*od"ic\, a. [Pref. per- + iodic.] (Chem.)
    Pertaining to, derived from, or designating, the highest
    oxygen acid (HIO?) of iodine.
  2. \Pe`ri*od"ic\, Periodical \Pe`ri*od"ic*al\, a. [L.
    periodicus, Gr. ?: cf. F. p['e]riodique.]
    1. Of or pertaining to a period or periods, or to division by
             The periodicaltimes of all the satellites. --Sir J.
    2. Performed in a period, or regular revolution; proceeding
       in a series of successive circuits; as, the periodical
       motion of the planets round the sun.
    3. 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.
             The periodic return of a plant's flowering.
             To influence opinion through the periodical press.
    4. (Rhet.) Of or pertaining to a period; constituting a
       complete sentence.
    {Periodic comet} (Astron.), a comet that moves about the sun
       in an elliptic orbit; a comet that has been seen at two of
       its approaches to the sun.
    {Periodic function} (Math.), a function whose values recur at
       fixed intervals as the variable uniformly increases. The
       trigonomertic functions, as sin x, tan x, etc., are
       periodic functions. Exponential functions are also
       periodic, having an imaginary period, and the elliptic
       functions have not only a real but an imaginary period,
       and are hence called doubly periodic.
    {Periodic law} (Chem.), the generalization that the
       properties of the chemical elements are periodic functions
       of their atomic wieghts. ``In other words, if the elements
       are grouped in the order of their atomic weights, it will
       be found that nearly the same properties recur
       periodically throughout the entire series.'' The following
       tabular arrangement of the atomic weights shows the
       regular recurrence of groups (under I., II., III., IV.,
       etc.), each consisting of members of the same natural
       family. The gaps in the table indicate the probable
       existence of unknown elements.
Thesaurus Terms
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