The compound 'three-quarters' is a transparent English construction built from native Germanic and Latinate elements. Its first element, 'three', descends directly from the Proto-Indo-European root trei-, which gave rise to the number across many Indo-European languages, signifying its fundamental nature. The second element, 'quarter', entered English via Old French from the Latin quartus, meaning 'fourth', which itself derives from quattuor for 'four'. The literal combination, 'three fourths', is a precise mathematical expression that has retained its direct, compositional meaning from its components. The addition of the plural '-s' solidifies its grammatical function as a noun, allowing it to refer to the specific quantity or proportion itself.

Structure: three (number) + quarter (one fourth) + s (plural suffix) - three: From Old English þrīe, of Germanic origin; related to Dutch drie and German drei, from an Indo-European root shared by Latin tres and Greek treis. Functions as the cardinal number. - quarter: From Old French quartier, based on Latin quartus 'fourth', from quattuor 'four'. Functions as a noun meaning 'one fourth'. - s: From Old English, a common Germanic plural suffix. Functions as a grammatical marker of plurality.