sept

Sept is a term with multiple uses linked by a common origin. It derives from the Latin septem meaning seven. In French, sept is the everyday word for seven and appears in phrases such as sept heures (seven o’clock). In English, sept- functions as a combining form in words that signal seven or sevenfold, for example septet (a group of seven), septuple (sevenfold), and septennial (occurring every seven years).

In the calendar, September is the name of the ninth month. The name comes from the Latin septem, reflecting that it was once the seventh month in the early Roman calendar before the addition of January and February in later reforms.

In science and anatomy, sept- appears in terms like septum (a wall dividing a cavity), septate (having septa or walls), and septation (the process of forming a septum). In mycology, septate hyphae have cross walls, whereas non-septate hyphae lack them. These uses reflect the broader Latin-root meaning seven, extended into disciplines that describe partitions and groupings.