multimonth

Multimonth is an adjective and noun used to describe a period or item that spans more than one calendar month. It is formed from the prefix multi- (many) and month, and may appear as multimonth or, less often, as multi-month. As a term, it is typically used in planning, scheduling, or descriptions of timeframes that extend beyond a single month.

In calendars and planning, multimonth appears in phrases such as multimonth schedules, multimonth calendars, or multimonth horizons. In business and project management, it describes timelines, releases, or budgets that cover several months, for example a multimonth project plan or a multimonth forecast. In consumer services, multimonth may describe subscriptions or warranties billed over multiple months. In research and healthcare, multimonth studies or multimonth treatment courses indicate durations that span multiple calendar months.

Spelling and usage vary by style guide. Some sources prefer the hyphenated form multi-month, while others use the closed form multimonth. In practice, multimonth is less ambiguous than terms like bimonthly, which can be read as either every two months or twice a month. When clarity is essential, writers may opt for explicit phrases such as “spanning several months” or “over a period of n months.”

See also: monthly, bimonthly, semimonthly, planning horizons.