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Bloomfield's "lexical morpheme" hypothesis: morphemes, affixes and roots alike are stored in the lexicon. Morpheme-based morphology comes in two flavours, one Bloomfieldian [17] and one Hockettian. [18] For Bloomfield, the morpheme was the minimal form with meaning, but did not have meaning itself.
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).
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 known as lexicosemantics), as a subfield of linguistic semantics, is the study of word meanings. [1] [2] It includes the study of how words structure their meaning, how they act in grammar and compositionality, [1] and the relationships between the distinct senses and uses of a word.
Surface forms of words are those found in natural language text. The corresponding lexical form of a surface form is the lemma followed by grammatical information (for example the part of speech, gender and number). In English give, gives, giving, gave and given are surface forms of the verb give. The lexical form would be "give", verb.
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, may be thought of as a mono-morphemic stem. The traditional definition allows roots to be either free morphemes or bound morphemes.
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").
Unlike derivational suffixes, English derivational prefixes typically do not change the lexical category of the base (and are so called class-maintaining prefixes). Thus, the word do, consisting of a single morpheme, is a verb, as is the word redo, which consists of the prefix re-and the base root do.