Synchronically, a contemporary Korean adverb golgom(골고루) is related to another contemporary Korean adjectival stem goreu-(고르-) in its meaning. This adverb is a derivational adverb that was originally formed after combining a derivational adverbial suffix -u(-우) to a stem goreu-(고르-). goru (고루) created a repetitious adverb gorugoru(고루고루) and golgoru(골고루) is a contracted form of he second syllable from this word. Such a short form of the adverb golgoru(골고루) has the same type of adverb historically. That is, by combining a derivational adverbial suffix -o(-오) to the medieval adjectival stem goru-(고?-), a derivational adverb golo(골오) was created. This derivational adverb golo(골오) was developed the same way that other derivational adverbs of middle Korean, such as doro(도로) dol-(돌-) 廻), nazo(나? naz-(?-) 進), oaro(오?로 oal-(오?-全), and giuru(기우루), giul-(기울- 斜) did. In modem Korean, a middle Korean derivational adverb golo(골오) becomes goro(고로) by transcribing a final consonant (cluster) r(ㄹ) of the initial syllable to -o(-오) of the forthcoming syllable and from this a repetitious adverb of two same words gorogoro(고로고로) is created. And, this repetitious adverb gorogoro(고로고로) rarely appears to be goloro(골오로), and this is similar to that of the shorten form in contemporary Korean. But we interpret this gororo(고로로)(rarely goloro(골오로) in that the adverbial auxiliary particle ro(로) was integrated into the derivational adverb goro(고로) and think of it as a surplus. That is, goro(고로) is already an adverb and to this, again, the adverb-forming auxiliary particle ro(로) integrates to form another adverb; therefore, this phenomenon is redundant. ro(로) from the examples of nalro(날로), saero(새로), and silro(실로) in the middle may be considered as the adverb-forming auxiliary particle. The contemporary Korean contracted form golgoro(골고루) appears as gororo(고로로)(rarely goloro(골오로)) in modern Korean and the form may look similar but its inner structures are different. The adverb golo(골오) derived from middle Korean becomes goro(고로) in modern Korean; this adverb restructured its lexicon to the adjectival stem goro-(고로-) in modem Korean. In fact, from the records of modern Korean, the examples of endings -gae(-게), -go(-고), -di(-디), and -n(-ㄴ) integrating to the adjectival stem goro-(고로-) can be found. gorogae hajeo(고로게 ?여), gorogae hara(고로게 ?라), gorogo(고로고), gorodi(고로디), and goron(고론) are such examples. In contemporary Korean, in order for a repetitious adverb of two same words gorogoro(고로 고로) to be the contracted form golgoru(골고루), there should be a form gol(골) historically. That is, because the form of gol(골) exists from golo(골오) by integrating the adverb derivational suffix -o(-오) to gora-(고?-) in middle Korean, golgoru(골고루) was able to form, contracted from tile contemporary Korean adverb gorugoru(고루 고루). In a similar case, in order for contemporary Korean gajigajiro(가지가지로) to become a weak form gasgasjiro(갖가지로) is because gaji(가지) was contracted to gas(갓) from the medieval Korean gasgasji(갓갓지). In conclusion, the following shows a lexical history of golgoru(골고루), a contracted form of the contemporary Korean repetitious derivational adverb gorugoru(고루 고루), presented step by step. Changeable process of Adverb golgoru(골고루) (a) Unification of middle Korean adjectival stem gora-(고?-) + adverbal derivational suffix -o(-오) : golo(골오) (b) Liasoin spelling of modern Korean golo(골오) : goro(고로) (c) Derivational adverb of modern Korean adverb: gorogoro(고로 고로) (d) Modern Korean derivational adverb goro(고로) + case maker ro(로) : gororo(고로로), goloro(골로로) (e) MOdem Korean adverb goro(고로) > Temporary Korean adverb goru(고루) : goru(고루) (f) Temporary Korean geminate adverb: gorugoru(고루 고루) (g) Diminished adverb of Temporary Korean geminate adverb : golgoru(골고루)