The word 'width' is a native English formation, built upon the existing adjective 'wide'. The Old English adjective wīd, meaning "spacious" or "far-extending", has Proto-Germanic origins (wīdaz) and is distantly related to words in other Indo-European languages implying separation or space. In Old English, the abstract noun suffix -þu was commonly added to adjectives to create nouns denoting a state or quality, as seen in lengþu (length) from lang (long). Over time, the suffix evolved into Modern English '-th'. Thus, 'width' literally means "the quality or state of being wide", a logical and direct derivation that concretizes the abstract dimension of breadth.

Structure: wid(e) (wide) + th (noun suffix) - wid(e): From Old English wīd (spacious, extensive). Functional role: The adjectival root providing the core meaning of "wide". - th: From Old English -þu, -þo, a suffix forming abstract nouns of state or quality. Functional role: A noun-forming suffix.