Denarius
Smith's Dictionary
(containing ten), Authorized Version “penny,” (Matthew 18:28; 20:2,9,13) a Roman silver coin in the time of our Saviour and the Apostles, worth about 15 cents. It took its name from its being first equal to ten “asses,” a number afterwards increased to sixteen. It was the principal silver coin of the Roman commonwealth. From the parable of the laborers in the vineyard it would seem that a denarius was then the ordinary pay for a day’s labor. (Matthew 20:2,4,7,9,10,13)
International Standard Bible Encyclopedia
de-na'-ri-us (denarion): A Roman silver coin, 25 of which went to the aureus, the standard gold coin of the empire in the time of Augustus, which was equal in value to about one guinea or $5,25; more exactly œ1.0,6 = $5.00, the œ = $4,866. Hence, the value of the denarius would be about 20 cents and this was the ordinary wage of a soldier and a day laborer. The word is uniformly rendered "penny" in the King James Version and "shilling" in the American Standard Revised Version, except in Mt 22:19; Mr 12:15 and Lu 20:24, where the Latin word is used, since in these passsages it refers to the coin in which tribute was paid to the Roman government. See MONEY.
H. Porter