Meaning : At or constituting a border or edge.
Example :
The marginal strip of beach.
Synonyms : fringy
Meaning : Of questionable or minimal quality.
Example :
Borderline grades.
Marginal writing ability.
Synonyms : borderline
Meaning : Just barely adequate or within a lower limit.
Example :
A bare majority.
A marginal victory.
Synonyms : bare
Meaning : Producing at a rate that barely covers production costs.
Example :
Marginal industries.