calendar month see under month

calendar year see under year

perpetual calendar see under perpetual

month /munth/

1. One of the twelve conventional divisions of the year, or its length, a calendar month
2. Such a length of time, loosely taken as four weeks or 30 days
3. The length of time taken by the moon to revolve once around the earth (29.53 days), a lunar month

monthˈling noun (archaic)

A month-old child

monthˈly adjective

1. Performed in a month
2. Done, recurring, or appearing once a month

1. A monthly publication
2. A monthly rose
3. (pl) the menses (informal)

1. Once a month
2. In every month

monthly nurse noun

A nurse attending a woman in the first month after childbirth

monthly rose noun

A rose supposed to bloom every month

month's mind see under mind

a month of Sundays see under Sunday

anomalistic month

The interval between the moon's perigee passages = 27.5545 days

sidereal or stellar month

The time in which the moon passes round the ecliptic to the same point among the stars = 27.3217 days

solar month

One-twelfth of a solar year

synodic month

The period of the moon's phases = 29.5306 days

tropical or periodic month

The time from the moon's passing the equinox until it reaches it again = 27.3216 days