noun rid·er \ˈrī-dər\

: a person who rides something

: an official document that is attached to another document and that adds to or changes information in the original document

: an additional part added to a legislative bill

Full Definition of RIDER

:  one that rides
a :  an addition to a document (as an insurance policy) often attached on a separate piece of paper
b :  a clause appended to a legislative bill to secure a usually distinct object
:  something used to overlie another or to move along on another piece
rid·er·less \-ləs\ adjective

Examples of RIDER

  1. Watch out for bike riders while driving.
  2. She added a rider to her life insurance policy that increased her coverage.
  3. Congress added a rider to the health insurance bill.

First Known Use of RIDER

14th century
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