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In my view, the Christian religion is the most important and one of the first things in which all children, under a free government ought to be instructed... No truth is more evident to my mind than that the Christian religion must be the basis of any government intended to secure the rights and privileges of a free people.
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1828 Noah Webster Dictionary
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1828.mshaffer.com › Word [periodic]

Evolution (or devolution) of this word [periodic]

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PERIOD'IC

N / A

Per`i*od"ic
  1. Pertaining to, derived from, or designating, the highest oxygen acid (HIO(?)) of iodine.
  2. Of or pertaining to a period or periods, or to division by periods.

    The periodicaltimes of all the satellites. Sir J. Herschel.

  3. Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.
  4. 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.

  5. 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  RO2  R2O5  RO3  R2O7  RO4  
 --------------------------------------------------------------
    H1

    Li 7

    Na 23

    K 39

    (Cu) 63

    Rb 85.2

    (Ag) (108)

    Cs 133

    (-)

    (-)

    (Au) (197)

    (-)

    -----------------------------------------------------------------

    * A similar relation had been enunciated in a crude way by Newlands; but the law in its effective form was developed and elaborated by Mendelejeff, whence it is sometimes called Mendelejeff's law. Important extensions of it were also made by L. Meyer. By this means Mendelejeff predicted with remarkable accuracy the hypothetical elements ekaboron, ekaluminium, and ekasilicon, afterwards discovered and named respectively scandium, gallium, and germanium.

    -- Periodic star (Astron.), a variable star whose changes of brightness recur at fixed periods. -- Periodic time of a heavenly body (Astron.), the time of a complete revolution of the body about the sun, or of a satellite about its primary.

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Periodic

PERIOD'IC

PERIOD'ICAL, adjective

1. Performed in a circuit, or in a regular revolution in a certain time, or in a series of successive circuits; as the periodical motion of the planets round the sun; the periodical motion of the moon round the earth.

2. Happening by revolution, at a stated time; as, the conjunction of the sun and moon is periodical.

3. Happening or returning regularly in a certain period of time. The Olympiads among the Greeks were periodical, as was the jubilee of the Jews.

4. Performing some action at a stated time; as the periodical fountains in Switzerland, which issue only at a particular hour of the day.

5. Pertaining to a period; constituting a complete sentence.

6. Pertaining to a revolution or regular circuit.

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Word of the Day

importance

IMPORT'ANCE, n.

1. Weight; consequence; a bearing on some interest; that quality of any thing by which it may affect a measure, interest or result. The education of youth is of great importance to a free government. A religious education is of infinite importance to every human being.

2. Weight or consequence in the scale of being.

Thy own importance know.

Nor bound thy narrow views to things below.

3. Weight or consequence in self-estimation.

He believes himself a man of importance.

4. Thing implied; matter; subject; importunity. [In these senses, obsolete.]

Random Word

falling

FALL'ING, ppr. Descending; dropping; disemboguing; apostatizing; declining; decreasing; sinking; coming.

FALL'ING,

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