Ryder

Part of speech: noun

Definitions

1. A supplementary clause or amendment attached to a bill or legal document ; a person who sits on and controls a horse or bicycle
2. An extra provision appended to a formal document or piece of legislation ; someone who travels on horseback or on a bicycle
3. A supplementary stipulation added to a legal paper or statute ; a horse-mounted traveller or a person riding a cycle

Etymology: A "ryder" is a supplementary clause attached to a document, most often a bill passed by a legislature or a contract, and the word came into English from Dutch, where "rijder" simply meant "rider," someone who rides a horse. The link is the image of an addition riding along on the main text, sitting on top of it rather than being part of its body. The sense of a rider as something attached to a larger whole follows naturally from that picture. A legislator might tack an unrelated provision onto a bill that has little chance of passing on its own, and the extra clause is said to "ride" along with it. That practice gave the term its political flavour, which is why the word still turns up most often in parliamentary and legislative contexts.

Synonyms: rider, addendum, codicil