A pair of
affixes that must be used together, one as a
prefix, the other as a
suffix (Latin
circum '
around').
An example is in the negative in Maltese: hu 'he is', cf. mhux 'he is not'.
Another is in German past participles, as gefragt 'asked' from fragen 'to ask'.
Another is the Tzotzil definite article: vaj 'tortilla', li vaj e 'the tortilla'.