supermarginal
/ˌsuːpəˈmɑːdʒɪnl/ /ˌsuːpəˈmɑːdʒɪ(ə)nl/ /ˌsjuːpəˈmɑːdʒɪnl/adjective
1 Zoology and Anatomy = supramarginal.
2Better or more than marginal in quality or degree; (Economics ) involving or achieving a greater than marginal level of profit or value.
3 Economics. Of land or ore: of greater profitability than marginal land or ore. Of a farmer, etc.: working such land.
4 Politics. Designating a constituency, etc., in which an election is expected to be extremely closely contested, the sitting or outgoing member typically having only a very small majority.
noun
1 Zoology. A supermarginal part; especially one the plates lying above the marginal plates of a starfish arm. rare.
2 Politics. A supermarginal constituency or seat.
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From super- + marginal.