'only' originates from Old English, specifically the word 'ānlic,' where 'ān' meant 'one' and '-lic' meant 'like.'

'ānlic' changed from Old English to the Middle English word 'onli,' and eventually became the modern English word 'only'.

Initially, it meant 'one-like' or 'unique,' but over time it evolved into its current meaning of 'sole' or 'just.'