one-word
/wˈɒnwˈɜːd/
/wˈʌnwˈɜːd/
Etymology
Old EnglishEnglish
This compound joins one and word, both core English vocabulary going back to Old English. Hyphenating two everyday words to form an attributive adjective is a regular pattern in modern English, used to describe something defined by a count of its parts, like two-page report or three-hour meeting.