Subsidiary
来自Big Physics
mid 16th century (in the sense ‘serving to help or supplement’): from Latin subsidiarius, from subsidium ‘support, assistance’ (see subsidy).
wiktionary
From Middle French subsidiaire, from Latin subsidiarius(“belonging to a reserve”).
etymonline
subsidiary (adj.)
1540s, from Latin subsidiarius "belonging to a reserve, of a reserve, reserved; serving to assist or supplement," from subsidium "a help, aid, relief, troops in reserve" (see subsidy). As a noun, c. 1600, "subsidiary thing." In Latin the word was used as a noun meaning "the reserve."
