[...] a morpheme in a given language is defined only relative to the whole morpheme stock of the language: a morpheme is something ‘different’ from all the other morphemes of the language.
- Hockett (1958), a pag.134

[...] a morpheme not only carries essentially the same meaning wherever it occurs, but also appears everywhere in exactly the same phonemic shape. [...] morphemes which are identical in phonemic shape, yet distinct because of difference in meaning. [...]. This leads to a consideration of the converse: morphemes which [...] are distinct because of differing phonemic shape, but which have identical meaning.
- Hockett (1958), a pag.130

[…] it is clear that the morphemes of a language do not occur freely in all conceivable arrangements, but only in some.
- Hockett (1958), a pag.128

‘Morphemes are the smallest individually meaningful elements in the utterances of a language’.
- Hockett (1958), a pag.123