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sidereal month

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noun Astronomy.

See under month(def 5).

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Words nearby sidereal month

sidepiece, sidereal, sidereal day, sidereal hour, sidereal hour angle, sidereal month, sidereal period, sidereal time, sidereal year, siderite, sidero-

Origin of sidereal month

First recorded in 1865–70

Definition for sidereal month (2 of 2)

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

British Dictionary definitions for sidereal month (1 of 2)

sidereal month

noun

See month (def. 5)

British Dictionary definitions for sidereal month (2 of 2)

month
/ (mʌnθ) /

noun

Other words from month

Related adjective: mensal

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

Idioms and Phrases with sidereal month

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.