If you guessed that expropriate has something in common with the verb appropriate, you're right. Both words ultimately derive from the Latin adjective proprius, meaning "own." Expropriate came to English by way of the Medieval Latin verb expropriare, itself from Latin ex- ("out of" or "from") and proprius. Appropriate descends from Late Latin appropriare, which joins proprius and Latin ad- ("to" or "toward"). Both the verb appropriate ("to take possession of" or "to set aside for a particular use") and the adjective appropriate ("fitting" or "suitable") have been with us since the 15th century, and expropriate was officially appropriated in the 17th century. Other proprius descendants in English include proper and property.