Routledge Dictionary of Language and Linguistics
1 Level of classification whose elements define the elements of the next highest level.
For example, morphophonemes are defined by phonemes.
2 In S.M.Lamb’s stratificational grammar, structural levels which are ordered hierarchically and have a systematic character: the lowest level corresponds to phonology (=hypophonemic and phonemic stratum); the intermediate level corresponds to syntax (=morphemic and lexemic stratum); and the highest level corresponds to semantics (=sememic and hypersememic stratum).
References
stratificational grammar
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