One that qualifies, especially one that has or fulfills all appropriate qualifications, as for a position, office, or task.
Grammar A word or phrase that qualifies, limits, or modifies the meaning of another word or phrase.
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.