PERIODICAL

periodic, periodical

(adjective) happening or recurring at regular intervals; “the periodic appearance of the seventeen-year locust”

periodical

(noun) a publication that appears at fixed intervals

Source: WordNet® 3.1

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Etymology

Noun

periodical (plural periodicals)

A publication issued regularly, but less frequently than daily.

A regularly issued thematic publication that contains the most current information in its field, often the primary means for communication of original scholarship or creative work at the cutting edge of research in its field.

Synonyms

• (a publication that appears at fixed intervals): serial

Adjective

periodical (comparative more periodical, superlative most periodical)

Periodic.

Synonyms: cyclic, Thesaurus:periodic

Published at regular intervals of more than one day, especially weekly, monthly, or quarterly.

Of, or relating to such a publication.

Anagrams

• pareidolic

Source: Wiktionary

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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

Pe`ri*od"ic*al, n.

Definition: A magazine or other publication which appears at stated or regular intervals.

Source: Webster’s Unabridged Dictionary 1913 Edition

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