'Calendar month' definitions:

Definition of 'calendar month'

noun

One of the twelve divisions of the calendar year; "he paid the bill last month" [syn: calendar month, month]

From: GCIDE

Calendar \Cal"en*dar\, n. [OE. kalender, calender, fr. L. kalendarium an interest or account book (cf. F. calendrier, OF. calendier) fr. L. calendue, kalendae, calends. See Calends.]
1. An orderly arrangement of the division of time, adapted to the purposes of civil life, as years, months, weeks, and days; also, a register of the year with its divisions; an almanac. [1913 Webster]
2. (Eccl.) A tabular statement of the dates of feasts, offices, saints' days, etc., esp. of those which are liable to change yearly according to the varying date of Easter. [1913 Webster]
3. An orderly list or enumeration of persons, things, or events; a schedule; as, a calendar of state papers; a calendar of bills presented in a legislative assembly; a calendar of causes arranged for trial in court; a calendar of a college or an academy. [1913 Webster]
Note: Shepherds of people had need know the calendars of tempests of state. --Bacon. [1913 Webster]
Calendar clock, one that shows the days of the week and month.
Calendar month. See under Month.
French Republican calendar. See under Vend['e]miaire.
Gregorian calendar, Julian calendar, {Perpetual calendar}. See under Gregorian, Julian, and Perpetual. [1913 Webster]