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a. A minor acting role, as in a play or on a television episode, usually without speaking lines.
b. A performer playing such a role.
2. Sports A collegiate athlete who has not been recruited and has no athletic scholarship.
a. a small part in a play or theatrical entertainment, esp one without any lines
b. (as modifier): a walk-on part.
(Aeronautics) (of an aircraft or air service) having seats to be booked immediately before departure rather than in advance
1. a small part in a play or other entertainment, esp. a part without speaking lines. Compare bit 2 (def. 4).
2. an athlete trying out for a team who has not been drafted, specifically invited, or awarded a scholarship.