What is the meaning of the word "collateral"?

Definitions:

  1. accompany, concomitant copy to clipboard adjective
    • collateral target damage from a bombing run copy to clipboard
  2. descended from a common ancestor but through different lines copy to clipboard adjective
    • cousins are collateral relatives copy to clipboard
  3. serving to support or corroborate copy to clipboard adjective
    • collateral evidence copy to clipboard
  4. situated or running side by side copy to clipboard adjective
    • collateral ridges of mountains copy to clipboard

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