'homosexuality' originates from a combination of the Greek word 'homo-' meaning 'same' and the Latin word 'sexualis' meaning 'relating to sex,' with the suffix '-ity' denoting a state or condition.

'homosexuality' was formed in the late 19th century from 'homosexual' (itself from 'homo-' + 'sexual') and the suffix '-ity,' and eventually became the modern English word 'homosexuality.'

Initially, it meant 'the quality or state of being sexually attracted to people of the same sex,' and this meaning has remained consistent in modern usage.