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The definition of morphemes also plays a significant role in the interfaces of generative grammar in the following theoretical constructs: Event semantics : the idea that each productive morpheme must have a compositional semantic meaning (a denotation ), and if the meaning is there, there must be a morpheme (whether null or overt).
Bloomfield's "sign base" morpheme hypothesis: As morphemes, they are dualistic signs, since they have both (phonological) form and meaning. Bloomfield's "lexical morpheme" hypothesis: morphemes, affixes and roots alike are stored in the lexicon. Morpheme-based morphology comes in two flavours, one Bloomfieldian [16] and one Hockettian. [17]
The root morpheme is the primary lexical unit of a word, which carries the most significant aspects of semantic content and cannot be reduced to smaller constituents. [3] The derivational morphemes carry only derivational information. [4] The affix is composed of all inflectional morphemes, and carries only inflectional information. [5]
Lexical semantics also explores whether the meaning of a lexical unit is established by looking at its neighbourhood in the semantic network, [7] (words it occurs with in natural sentences), or whether the meaning is already locally contained in the lexical unit. In English, WordNet is an example of a semantic network.
For example, the derivation of the word uncommon from common + un-(a derivational morpheme) does not change its part of speech (both are adjectives). An important distinction between derivational and inflectional morphology lies in the content/function of a listeme [ clarification needed ] .
Lexical meaning is not limited to a single form of a word, but rather what the word denotes as a base word. For example, the verb to walk can become walks , walked , and walking – each word has a different grammatical meaning, but the same lexical meaning ("to move one's feet at a regular pace").
For example, chatters has the inflectional root or lemma chatter, but the lexical root chat. Inflectional roots are often called stems. A root, or a root morpheme, in the stricter sense, a mono-morphemic stem. The traditional definition allows roots to be either free morphemes or bound morphemes.
Other terms for the contrast lexical vs. grammatical include: situation vs. viewpoint and inner vs. outer. [10] [11] Lexical aspect, also known as Aktionsart, is an inherent property of a verb or verb-complement phrase, and is not marked formally. The distinctions made as part of lexical aspect are different from those of grammatical aspect.