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In generative morphology, the ''righthand head rule'' is a rule of grammar that specifies that the rightmost morpheme in a morphological structure is always the head. What this means is that it is the righthand element that provides the primary syntactic and/or semantic information. The projection of syntactic information from the righthand element onto the output word is known as feature percolation. The righthand head rule is considered a broadly general and universal principle of morphology. ==The righthand head rule in derivational morphology== In derivational morphology (i.e. the creation of new words), the head is that morpheme that provides the part of speech (PoS) information. According to the righthand head rule, this is of course the righthand element. For instance, the word 'person' is a noun, but if the suffix '-al' is added and 'personal' is derived. 'Personal' is an adjective, and the righthand head rule holds that the PoS information is provided by the suffix '-al', which is the righthand element. The adverb 'personally' is derived from 'personal' by adding the suffix '-ly'. The PoS-information is provided by this suffix which is added to the right of 'personal'. The same applies to the noun 'personality', which is also derived from 'personal', this time by adding the nominal suffix '-ity' to the right of the input word. Again the PoS-information is projected from the righthand element. The three above examples may be formalized thus (N=noun, ADJ=adjective, ADV=adverb): *personN + -alADJ = personalADJ *personalADJ + -lyADV = personallyADV *personalADJ + -ityN = personalityN They are all instance of the righthand head rule, which may be formalized as: *Ax + By = Cy 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Righthand head rule」の詳細全文を読む スポンサード リンク
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