calendar month

American  

noun

1. month.

---

calendar month British  

noun

1. See month

---

Etymology

Origin of calendar month

First recorded in 1780–90

Example Sentences

Additionally there will be an extra full Moon on 31 May, known as a blue Moon - the name given to the second full Moon in a calendar month.

From BBC • Jan. 3, 2026

The average rent in Ealing is now £2,089 per calendar month, according to the analysis.

From BBC • Jul. 28, 2025

The phrase does not describe the color of the moon; instead, it refers to the second full moon occurring in one calendar month.

From Los Angeles Times • Sep. 17, 2024

Each month usually hosts only one full moon, but blue moons sometimes arise because the lunar cycle is 29.5 days long — just short of the length of an average calendar month.

From New York Times • Aug. 29, 2023

This would have applied to half the days of every calendar month throughout the year.

From Under the Skylights by Fuller, Henry Blake