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In a general sense, a row or series of objects. Hence


, in naval language, a row or tier of oars in a ship, as to which, see Navis.


In Roman political language, the word is applied to any body of men forming a distinct and separate class in the community, either as possessing special privileges, or as pursuing some special occupation. Thus, the senators are spoken of collectively as the ordo senatorius, the knights as the ordo equester; the priests (sacerdotes) as ordo sacerdotalis. The plebeians, however, are now spoken of as an ordo. The Senate, being the august body, is sometimes called amplissimus ordo at Rome, and in colonies and municipia the local Senate is ordo decurionum. (See Decuriones.) The libertini formed a separate ordo, and so did the scribae, the tribuni aerarii, and the publicani. At Rome the Senate and equestrians are often styled uterque ordo, as being the orders par excellence.


In military language, the word is applied to a company or troop of soldiers, and is used as equivalent to centuria, as the first centuries in a legion are sometimes called primi ordines. See Legio.

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