- a horse used in a race to set the pace for another horse from the same stable
- a candidate for the lesser of two closely associated offices, as for the vice-presidency, in his or her relationship to the candidate for the greater office
running materunning mate
- Either of a pair of candidates running together for two closely associated political offices, especially the candidate for the lesser of the two offices.
- A companion.
- A horse used to set the pace in a race for another horse.