Meaning of “month” - Learner’s Dictionary

month

noun [ C ] us uk /mʌnθ/
The new policy is due to be unveiled later this month.Sales figures showed a significant increase last month.He spent 18 months working on the project.I have to go to the doctor again in a month's time.The factory turns out more than 600 vehicles a month.
PART OF YEAR

A1 one of the twelve periods of time that a year is divided into:

last/next month
Your birthday's this month, isn't it?
FOUR WEEKS

A1 a period of approximately four weeks:

She'll be working here for six months.
I saw him about three months ago.

(Definition of “month” from the Cambridge Learner’s Dictionary © Cambridge University Press)