seven-tenths

The compound "seven-tenths" is a transparent numerical construction in English, directly combining a cardinal number with an ordinal fraction. "Seven" descends from the Proto-Indo-European root septḿ̥, a stable numeral preserved across major language families, as seen in Latin septem and Greek hepta. "Tenth" derives from the Old English tēoþa, which itself originates from the PIE root deḱm̥t, meaning "ten," with the '-th' suffix forming ordinals—a pattern common to Germanic languages. The modern compound logically and literally denotes a division of a whole into ten equal parts, of which seven are taken, maintaining a direct, arithmetic relationship between its morphemic components and its contemporary meaning as a precise fractional quantity.

Structure: seven (cardinal number) + tenths (ordinal plural) - seven: From Old English seofon, of Germanic origin; related to Dutch zeven and German sieben, from an Indo-European root shared by Latin septem and Greek hepta. Functions as the cardinal number denoting quantity. - tenths: From Old English tēoþa (tenth), from tīen (ten). The suffix '-th' forms ordinal numbers from cardinals. The final 's' indicates the plural form. Functions as the ordinal fraction denominator.