Uddrag fra Semantics. Scope, Definitions, Methods, [Nice1951] 046-0610

It should be kept in mind, however, that such terms as word, morpheme, phrase, sentence, often are used to refer to the form of a word, a morpheme, etc. 4. A language may be called a system of significants in that it is both a system of symbol (i.e.significant) forms, and of symbol meanings.