Something that motivates, rouses, or encourages.
A bonus or reward, often monetary, to work harder.
Inciting; encouraging or moving; rousing to action; stimulating.
Serving to kindle or set on fire.
A motivational grudge against a person or faction, which may or may not be reciprocated; the state of having it in for someone.
Revenge.
A bitter, destructive feud, normally between two families, clans, or factions, in which each injury or slaying is revenged: a blood feud.