We express the partial distributional identity of any two morpheme classes by saying that these two classes have a morphemic component in common. If classes 'A' and 'B' occur together in certain utterances while 'A' and 'C' do not, we may say that 'A' and 'B' each contain or represent a morphemic component which is not represented by 'C'. If 'A' and 'D' each occur in the environment —'B', whereas 'E' and 'G' do not occur there, we may say that 'A' and 'D', as well as the environment 'B', each represent a morphemic component which is not represented by 'E' and 'G' (or by 'C').
- Harris (1951), Pag. 301

In the case of the morphemic segments, all interdipendent phonemes in our utterance were included in one segment. In the case of the morphemic components, all interdipendent morphemic choices in an utterance are included in one component.
- Harris (1951), Pag. 310, n.19