First in priority; more important than all others: Our overriding concern is the eradication of illiteracy.
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
Collins English Dictionary – Complete and Unabridged © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003
ThesaurusLegend: Synonyms Related Words Antonyms
Adj. 1. overriding - having superior power and influence; "the predominant mood among policy-makers is optimism"
paramount, predominate, preponderant, preponderating, predominant
dominant - exercising influence or control; "television plays a dominant role in molding public opinion"; "the dominant partner in the marriage"