Noah Webster's Dictionary 1. (n.) The area in the central part of an amphitheater, in which the gladiators fought and other shows were exhibited; -- so called because it was covered with sand. 2. (n.) Any place of public contest or exertion; any sphere of action; as, the arena of debate; the arena of life. 3. (n.) Sand or gravel in the kidneys.

Multi-Version Concordance Arena (1 Occurrence) 1 Corinthians 4:9 For it seems to me that God has put us the Apostles last of all, as men whose fate is death: for we are put on view to the world, and to angels, and to men. (See NIV)