Definition of month
1 : a measure of time corresponding nearly to the period of the moon's revolution and amounting to approximately 4 weeks or 30 days or ¹/₁₂ of a year
2 months plural : an indefinite usually extended period of time
he has been gone for months
3 : one ninth of the typical duration of human pregnancy
she was in her eighth month

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Time Traveler for month
The first known use of month was before the 12th century
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