From the Greek for a ‘contest’, meaning the nervous feeling experienced before such a contest. It is in that sense that Jesus was in an agony in the garden of Gethsemane (Luke 22: 44).
Citation for agony
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"agony." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. Jun 19, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e50>.
Chicago
"agony." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e50 (accessed Jun 19, 2013).