certainly
men marks a month as a unit of time, whether counting a duration, locating an event, or naming a recurring cycle.
The noun forms denote months as units of time: counted spans of residence, activity, pregnancy, drought, and affliction; a calendar month; and a recurring monthly yield. The supplied verses show the term alongside both plural durations and singular calendar or recurring references.
Senses in use
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A month as a measured or recurring time unit · dominant
The accusative plural form occurs with counted durations: in Acts 18:11 the APB renders a stay of “a year and six months,” while Luke 1:24 renders Elizabeth’s seclusion as “five months.” In Luke 1:26 the dative singular places Gabriel’s sending “In the sixth month”; Galatians 4:10 names “months” among observed times; Revelation 11:2 gives forty-two months of trampling; and Revelation 22:2 describes fruit yielded “each month.”
In the Anselm Project Bible: Across the noun occurrences, the APB presents the time unit as “month” or “months,” including numbered durations and “each month.” In Hebrews 6:14 it includes “certainly,” and does not isolate the contribution of the supplied form there.