seven-month

The compound adjective "seven-month" is a transparent combination of two ancient Germanic roots. The first element, "seven," descends from the Proto-Indo-European numeral septḿ̥, which is remarkably stable across many language families, as seen in Latin septem and Greek heptá. The second element, "month," originates from the Proto-Germanic word for "moon" (mēnô), reflecting the early human practice of measuring time by lunar cycles. The compound's logic is purely descriptive, directly combining a count and a temporal unit to specify a duration. Its modern usage, often seen in contexts like "a seven-month journey" or "a seven-month-old baby," retains this literal, calendrical sense without metaphorical abstraction.

Structure: seven (number) + month (unit of time) - seven: From Old English seofon, from Proto-Germanic sebun, from Proto-Indo-European septḿ̥. Functions as a numerical root. - month: From Old English mōnaþ, from Proto-Germanic mēnōþs, related to mēnô ("moon"). Functions as a noun root denoting a unit of time.