Pronunciation: (ik-strôr'dn-er"ē, ek"stru-ôr'-),[key] —adj. 1. beyond what is usual, ordinary, regular, or established: extraordinary costs. 2. exceptional in character, amount, extent, degree, etc.; noteworthy; remarkable: extraordinary speed; an extraordinary man. 3. (of an official, employee, etc.) outside of or additional to the ordinary staff; having a special, often temporary task or responsibility: minister extraordinary and plenipotentiary.