Definition of "senior" []

• Of or being the older of two, especially the older of two persons having the same name, as father and son. (adjective)
• Of or relating to senior citizens. See Usage Note at old. (adjective)
• Being in a position, rank, or grade above others of the same set or class: a senior officer; the senior ship in the battle group. (adjective)
• Having precedence in making certain decisions. (adjective)
• Of or relating to the fourth and last year of high school or college: our senior class. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Burch won a three-way contested election to ­succeed senior partner Paul Lee and will assume the title of chair of the firm's board - essentially the ­senior ­partner role - from 1"
• "They would each, like Axelrod, carry the title senior advisor to the president."
• "He battled the great Johnny Chu of Harvard for the title senior year."