- an abstract phonological unit representing corresponding phonemes in different allomorphs of one morpheme. In English the symbol F may be used to represent a morphophoneme occurring in two related allomorphs, as f in leaf, but v in the plural leaves.
- a phonological entity comprising a bundle of distinctive features used in the representation of a morpheme.
- a symbol for a phonological alternation.
- the set of phonemes or sequences of phonemes that constitute the various allomorphs of a morpheme
