marginal
/ˈmɑːˌdʒɪn.əl/
noun
Meaning
Something that is marginal.
A constituency won with a small margin.
adjective
Meaning
Of, relating to, or located at or near a margin or edge; also figurative usages of location and margin (edge).
"In recent years there has been an increase in violence against marginal groups."
Determined by a small margin; having a salient characteristic determined by a small margin.
Pertaining to changes resulting from a unit increase in production or consumption of a good.