PERIODIC
periodic, occasional
(adjective) recurring or reappearing from time to time; “periodic feelings of anxiety”
periodic, periodical
(adjective) happening or recurring at regular intervals; “the periodic appearance of the seventeen-year locust”
Source: WordNet® 3.1
Etymology 1
Adjective
periodic (not comparable)
Relative to a period or periods.
Having repeated cycles.
Synonym: cyclic
Occurring at regular intervals.
Synonyms: cyclic, Thesaurus:periodic
Periodical.
(astronomy) Pertaining to the revolution of a celestial object in its orbit.
Antonym: non-periodic
(mathematics, stochastic processes, of a state) For which any return to it must occur in multiples of time steps, for some .
Antonym: aperiodic
(rhetoric) Having a structure characterized by periodic sentences.
Etymology 2
Adjective
periodic (not comparable)
Relating to the highest oxidation state of iodine; Of or derived from a periodic acid.
Anagrams
• poricide
Source: Wiktionary
Per`i*od"ic, a. Etym: [Pref. per- + iodic.] (Chem.)
Definition: Pertaining to, derived from, or designating, the highest oxygen
acid (HIO
Pe`ri*od"ic, Pe`ri*od"ic*al, a. Etym: [L. periodicus, Gr.
périodique.]
1. Of or pertaining to a period or periods, or to division by
periods.
The periodicaltimes of all the satellites. Sir J. Herschel.
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. Henslow.
To influence opinion through the periodical press. Courthope.
4. (Rhet.)
Definition: 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.
TABLE OF THE PERIODIC LAW OF THE CHEMICAL ELEMENTS (The vertical
columns contain the periodic groups) Series1{ 2{ 3{ 4{ 5{ 6{ 7{ 8{ 9{
10{ 11{ 12{ ---------------------------------------------------------
-----|I. II. III. IV. V. VI. VII. VIII. | RH4 RH3 RH3 RH |R2O RO R3O3
Source: Webster’s Unabridged Dictionary 1913 Edition