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subsidiary (adj.)

"held in reserve, held ready to furnish assistance," 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, one who or that which contributes aid or additional support." The Latin adjective also was used in Latin as a noun meaning "the reserve."

also from 1540s
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updated on September 18, 2023

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