portiō ōnis, f 2 PAR-, a share, part, portion, lot: brevissima vitae, Iu.
—A proportion, ratio: eadem ad decem homines servabitur portio, the same proportion, Cu.
—In the phrase, pro portione, in proportion, proportionally, relatively: adice nunc pro portione, quot, etc., L.: causis principia pro portione rerum praeponere.