Noun
(historical) A group of warriors or nobles accompanying a king or other leader.
(historical) A county, shire.
Source: en.wiktionary.orgBut the shift from count (comes) to duke (dux) and from county (comitatus) to duchy (ducatus) also signalled the progressive militarization of Italy. Source: Internet
Federal law, notably the Posse Comitatus Act of 1878, sharply limits military involvement in civilian law enforcement, creating a supporting role for the Guard. Source: Internet
Such entourages are named comitatus by historians, although it is not a contemporary term. It was adapted in the 19th century from a word used by the 2nd-century historian Tacitus to describe the close companions of a lord or king. Source: Internet
Coredon Dictionary of Medieval Terms p. 80 The comitatus comprised young men who were supposed to be utterly devoted to their lord. Source: Internet