caliber

the word 'caliber' entered english in the late 16th century from the french 'calibre', which itself was borrowed from the italian 'calibro'. its ultimate origin is the arabic word 'qālib', meaning a mold, form, or last (a shoemaker's model). the semantic journey is a clear example of technological transfer. the arabic term for a mold used in casting was applied to the bore of a firearm, referring to the mold that gives a cannonball its size. this technical sense of internal diameter was the first to enter english. over time, the meaning expanded metaphorically, applying the concept of measured size and quality to a person's abilities or character, leading to the modern abstract sense of degree of merit or competence.

Structure: cali + ber cali (from arabic 'qālib', meaning a mold or form) + ber (a common anglicized suffix used to form nouns, representing the adaptation of the arabic word into english via french).