I.that denotes an order of succession, ordinal: nomen, an ordinal numeral (primus, secundus, etc.), Prisc. p. 581 P. al.
A Latin Dictionary. Founded on Andrews' edition of Freund's Latin dictionary. revised, enlarged, and in great part rewritten by. Charlton T. Lewis, Ph.D. and. Charles Short, LL.D. Oxford. Clarendon Press. 1879.
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