Morphological dictionary

In the fields of computational linguistics and applied linguistics, a morphological dictionary is a linguistic resource that contains correspondences between surface form and lexical forms of words. 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. There are two kinds of morphological dictionaries: morpheme-aligned dictionaries and full-form (non-aligned) dictionaries.

In the fields of computational linguistics and applied linguistics, a morphological dictionary is a linguistic resource that contains correspondences between surface form and lexical forms of words. 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. There are two kinds of morphological dictionaries: morpheme-aligned dictionaries and full-form (non-aligned) dictionaries. ===Aligned morphological dictionaries=== In an aligned morphological dictionary, the correspondence between the surface form and the lexical form of a word is aligned at the character level, for example: (h,h) (o,o) (u,u) (s,s) (e,e) (s, ), (θ, ) Where θ is the empty symbol and signifies "noun", and signifies "plural". In the example the left hand side is the surface form (input), and the right hand side is the lexical form (output). This order is used in morphological analysis where a lexical form is generated from a surface form. In morphological generation this order would be reversed. Formally, if Σ is the alphabet of the input symbols, and \Gamma is the alphabet of the output symbols, an aligned morphological dictionary is a subset A \subset 2^{(L^*)} , where: L = (( \Sigma \cup { \theta } ) \times \Gamma) \cup (\Sigma \times ( \Gamma \cup { \theta } )) is the alphabet of all the possible alignments including the empty symbol. That is, an aligned morphological dictionary is a set of string in L^* . If we define the set E \subset \Sigma^* of input words such that E = { w: (w,w') \in U } , the correspondence function would be \tau : E \rightarrow 2^{\Gamma^{*}} defined as \tau(w) = w' : (w,w') \in U . ==References==

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