The Spanish word 'pugilismo' (meaning 'boxing') comes from the Latin word 'pugilismus', which was formed by combining two Latin elements: 'pugilis' meaning 'boxer' and the suffix '-ismus' meaning 'action, practice, or doctrine'. This combination literally created a word meaning 'the practice or sport of boxing'.

The word maintained its form and meaning quite closely as it evolved from Latin into Spanish, with just a minor modification of the ending from '-us' to '-o' to follow Spanish morphological patterns.

A related Spanish word is 'púgil' (boxer), which comes directly from the Latin 'pugilis'. This shorter word might be easier to remember, and you can think of 'pugilismo' as simply meaning 'the sport of the púgil'.

English speakers might recognize this word's connection to 'pugilist' (a boxer) and 'pugilism' (boxing), which share the exact same Latin origin. The English word 'pugilism' is particularly close to the Spanish 'pugilismo', differing only in its final letter. Both languages borrowed these terms from Latin to refer formally to the sport of boxing.