1. Serving to assist or supplement; auxiliary.
2. Secondary in importance; subordinate.
3. Of, relating to, or of the nature of a subsidy.
n. pl. sub·sid·i·ar·ies
1. One that is subsidiary to another.
2. A subsidiary company.
3. Music A theme subordinate to a main theme or subject.
[Latin subsidiārius, from subsidium, support; see SUBSIDY.]
sub·sid′i·ari·ly (-ârə-lē) adv.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.