Hypertext Webster Gateway: "month"

From Easton's 1897 Bible Dictionary (easton)

Among the Egyptians the month of thirty days each was in use
long before the time of the Exodus, and formed the basis of
their calculations. From the time of the institution of the
Mosaic law the month among the Jews was lunar. The cycle of
religious feasts depended on the moon. The commencement of a
month was determined by the observation of the new moon. The
number of months in the year was usually twelve (1 Kings 4:7; 1
Chr. 27:1-15); but every third year an additional month
(ve-Adar) was inserted, so as to make the months coincide with
the seasons.

"The Hebrews and Phoenicians had no word for month save
'moon,' and only saved their calendar from becoming vague like
that of the Moslems by the interpolation of an additional month.
There is no evidence at all that they ever used a true solar
year such as the Egyptians possessed. The latter had twelve
months of thirty days and five epagomenac or odd days.",
Palestine Quarterly, January 1889.

From Webster's Revised Unabridged Dictionary (1913) (web1913)

Month \Month\, n. [OE. month, moneth, AS. m[=o]n?, m[=o]na?;
akin to m[=o]na moon, and to D. maand month, G. monat, OHG.
m[=a]n[=o]d, Icel. m[=a]nu?r, m[=a]na?r, Goth. m[=e]n[=o]?s.
[root]272. See {Moon}.]
One of the twelve portions into which the year is divided;
the twelfth part of a year, corresponding nearly to the
length of a synodic revolution of the moon, -- whence the
name. In popular use, a period of four weeks is often called
a month.

Note: In the common law, a month is a lunar month, or
twenty-eight days, unless otherwise expressed.
--Blackstone. In the United States the rule of the
common law is generally changed, and a month is
declared to mean a calendar month. --Cooley's

{A month mind}.
(a) A strong or abnormal desire. [Obs.] --Shak.
(b) A celebration made in remembrance of a deceased person a
month after death. --Strype.

{Calendar months}, the months as adjusted in the common or
Gregorian calendar; April, June, September, and November,
containing 30 days, and the rest 31, except February,
which, in common years, has 28, and in leap years 29.

{Lunar month}, the period of one revolution of the moon,
particularly a synodical revolution; but several kinds are
distinguished, as the {synodical month}, or period from
one new moon to the next, in mean length 29 d. 12 h. 44 m.
2.87 s.; the {nodical month}, or time of revolution from
one node to the same again, in length 27 d. 5 h. 5 m. 36
s.; the {sidereal}, or time of revolution from a star to
the same again, equal to 27 d. 7 h. 43 m. 11.5 s.; the
{anomalistic}, or time of revolution from perigee to
perigee again, in length 27 d. 13 h. 18 m. 37.4 s.; and
the {tropical}, or time of passing from any point of the
ecliptic to the same again, equal to 27 d. 7 h. 43 m. 4.7

{Solar month}, the time in which the sun passes through one
sign of the zodiac, in mean length 30 d. 10 h. 29 m. 4.1

From Webster's Revised Unabridged Dictionary (1913) (web1913)

Sidereal \Si*de"re*al\, a. [L. sidereus, from sidus, sideris, a
constellation, a star. Cf. {Sideral}, {Consider}, {Desire}.]
1. Relating to the stars; starry; astral; as, sidereal

2. (Astron.) Measuring by the apparent motion of the stars;
designated, marked out, or accompanied, by a return to the
same position in respect to the stars; as, the sidereal
revolution of a planet; a sidereal day.

{Sidereal clock}, {day}, {month}, {year}. See under {Clock},
{Day}, etc.

{Sideral time}, time as reckoned by sideral days, or, taking
the sidereal day as the unit, the time elapsed since a
transit of the vernal equinox, reckoned in parts of a
sidereal day. This is, strictly, apparent sidereal time,
mean sidereal time being reckoned from the transit, not of
the true, but of the mean, equinoctial point.

From WordNet (r) 1.7 (wn)

n 1: one of the twelve divisions of the calendar year; "he paid
the bill last month" [syn: {calendar month}]
2: a time unit of 30 days; "he was given a month to pay the

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