sidereal month
noun Astronomy.
See under month(def 5).
RELATED CONTENT
Does Bimonthly Mean Twice A Month Or Every Two Months?The prefix bi- usually means ‘every two’, so bimonthly means ‘every two months’.Semi- means ‘half’ or ‘halfway’, so semimonthly means ‘every two weeks’. However, bimonthly can also mean ‘twice a month’ – but it is rarely used that way. It is best to remember that bi- is “every two” and semi- is “halfway.”
Nearby words
- sidepiece,
- sidereal,
- sidereal day,
- sidereal hour,
- sidereal hour angle,
- sidereal period,
- sidereal time,
- sidereal year,
- sidereally,
- siderite
Origin of sidereal month
First recorded in 1865–70
month
[ muhnth ]
/ mʌnθ /
noun
Also called calendar month. any of the twelve parts, as January or February, into which the calendar year is divided.
the time from any day of one calendar month to the corresponding day of the next.
a period of four weeks or 30 days.
Also called solar month. one-twelfth of a solar or tropical year.
Also called lunar month. the period of a complete revolution of the moon around the earth, as the period between successive new moons (synodic month), equal to 29.531 days, or the period between successive conjunctions with a star (sidereal month), equal to 27.322 days, or the period between successive perigees (anomalistic month), equal to 27.555 days, or the period between successive similar nodes (nodical month or draconic month), equal to 27.212 days.
an unusually long period of time of indefinite length: I haven't seen him for months.
Origin of month
before 900; Middle English; Old English mōnath; cognate with Old High German mānōd, Old Norse mānathr. See moon
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
sidereal month
noun
See month (def. 5)
month
/ (mʌnθ) /
noun
Word Origin for month
Old English mōnath; related to Old High German mānōd, Old Norse mānathr; compare Gothic mena moon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
month
Old English monað, from Proto-Germanic *menoth- (cf. Old Saxon manoth, Old Frisian monath, Middle Dutch manet, Dutch maand, Old High German manod, German Monat, Old Norse manaðr, Gothic menoþs "month"), related to *menon- "moon" (see moon (n.); the month was calculated from lunar phases). Its cognates mean only "month" in the Romance languages, but in Germanic generally continue to do double duty. Phrase a month of Sundays "a very long time" is from 1832 (roughly 7 and a half months, but never used literally).
Online Etymology Dictionary, © 2010 Douglas Harper
month
In addition to the idiom beginning with month
- month of Sundays, a
also see:
- by the day (month)
- (for months) on end
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.