The American sinologist Marc S. Abramson explains why "barbarian" is the appropriate translation for general terms like fan 番 and hu 胡, but not specific ones like fancai 番菜 "foreign-style food".
Translations such as "foreigner" and "alien," though possessing an air of scholarly neutrality, are inappropriate as a general translation because they primarily connote geographic and political outsiderness, implying that individuals and groups so designated were external to the Tang Empire and ineligible to become subjects of the empire.
This was frequently not the case with many uses of fan and related terms — most common among them were hu (often used in the Tang to denote Central Asians) and four ethnonyms of great antiquity that, by the Tang, were mostly used generically with implicit geographic connotations: yi (east), man (south), rong (west), and di (north) — that largely connoted cultural and ethnic otherness but did not exclude the designated persons or groups from membership in the empire.
Although the term barbarian has undergone many transformations from its Greek origins to its current English usage, not all of which are relevant to the Tang (such as its use in medieval Europe to denote religious difference, marking non-Christians of various ethnic, geographic, and political affiliations), its consistent association with inferiority, lack of civilization, and externality in the broadest sense often make it the most appropriate choice, including some cases when it is placed in the mouths of non-Han referring to themselves or others.
[3]The following table summarizes the various ethnic groups and/or other social groups of known historical significance to the history of China (any non clear-cut connection is denoted by a question mark): c. 4th century BC to late 5th century, assimilated into Hans (There exist descendants of war-scattered Khitan soldiers sent to Yunnan and Guangxi provinces during the Yuan dynasty in Baoshan, Yunnan) There remain descendants of Mongol soldiers sent to Sichuan, Yunnan, and Guangxi provinces during the Yuan dynasty.