adj.
▸Brit. (of a parliamentary seat) having a small majority.
- relating to or situated at the margin:
marginal notes.
▸relating to water adjacent to the land's edge or coast:
marginal aquatics.
- of secondary or minor importance.
▸(of costs or benefits) relating to or resulting from small or unit changes.
- (of a decision or distinction) very narrow.
n.
- Brit. a marginal parliamentary seat.
- a plant that grows in water close to the edge of land.
Derivative