Pronunciation: (mär'ju-nl), [key]
1. pertaining to a margin.
2. situated on the border or edge.
3. at the outer or lower limits; minimal for requirements; almost insufficient: marginal subsistence; marginal ability.
4. written or printed in the margin of a page: a marginal note.
5. Sociol.marked by contact with disparate cultures, and acquiring some but not all the traits or values common to any one of them.
a. selling goods at a price that just equals the additional cost of producing the last unit supplied.
b. of or pertaining to goods produced and marketed at margin: marginal profits.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.