I. səb-ˈsi-dē-ˌer-ē, -ˈsi-də-rē adjective
Etymology: Latin subsidiarius, from subsidium reserve troops
Date: 1543
1.
a. : furnishing aid or support : auxiliary
subsidiary details
b. : of secondary importance
a subsidiary stream
2. : of, relating to, or constituting a subsidy
a subsidiary payment to an ally
• sub·sid·i·ari·ly -ˌsi-dē-ˈer-ə-lē adverb
II. noun
( plural -ar·ies )
Date: 1603
: one that is subsidiary ; especially : a company wholly controlled by another