circumfix UK /ˈsəːkəmfɪks/US /ˈsɚkəmfɪks/noun 1/sɚkəmˈfɪks/ verb 1forms 3 noun1 •An affix containing both a prefixing and a suffixing element existing as a single morphological unit. circumfix UK /səːkəmˈfɪks/US /sɚkəmˈfɪks/ verb1 •Affix a circumfix to (a word). formscircumfixed · circumfixing · circumfixes