The Spanish word 'colegio' (meaning 'school' or 'college') comes from the Latin word 'collegium', which meant 'an association of colleagues'. This Latin word was formed by combining 'collega' (meaning 'colleague') with the suffix '-ium', which was used to form abstract nouns.

Going even further back, 'collega' itself was created from two Latin elements: the prefix 'com-' meaning 'together' and 'legere' meaning 'to read' or 'to choose'. So etymologically, a 'colegio' was literally a place where people came together to read or study.

A closely related Spanish word is 'colega', which means 'colleague' or 'fellow' and comes directly from the Latin 'collega'. While 'colegio' refers to the institution or place of learning, 'colega' refers to the people who work or study together.

Several common English words share the same Latin roots as 'colegio'. The most obvious ones are 'college' and 'collegiate', which come from the same Latin 'collegium'. The word 'colleague' comes from Latin 'collega', and even the word 'collect' is related, as it comes from Latin 'colligere' (from 'com-' + 'legere'), originally meaning 'to gather together'. This shows how the basic idea of 'bringing together' runs through all these related words.