| Definition -
1. A type of affix that consists of suprasegmental features, e.g. a stress or tone pattern.
2. A type of affix where a change of tone or stress modifies an existing word's meaning. For example, the creation of nouns by changing the pronunciation of an existing word: the noun próduce (vegetables or fruit) was coined as an initially stressed version of the verb prodúce (create or bring forth).
Oxford English Dictionary - The term's first citation is from 1949:
"Suprafixes are morphemes which consist wholly of suprasegmental phonemes and which are added to the root or stem. …."
(E. A. Nida Morphol. (ed. 2) iii. 69)
1. As the OED quote shows, the primary meaning of suprafix is: "a type of affix that consists of suprasegmental features, e.g. a stress or tone pattern". The use of suprafix for a *change* of tone or stress is a later development.