1. At or constituting a border or edge
   "the marginal strip of beach";
   - fringy
    
2. Of questionable or minimal quality
   "marginal writing ability";
   - borderline
    
3. Just barely adequate or within a lower limit
   "a marginal victory";
   - bare
    
4. Producing at a rate that barely covers production costs
   "marginal industries"
    
5. (statistics) of or relating to a subset of random variables (with other variables having been marginalized)
   "The marginal distribution of X can be obtained by integrating out Y from the joint distribution"

1. An electoral constituency where there is only a small difference between the number of votes the leading parties expect
   "The party focused its campaign efforts on several marginal seats";
   - marginal constituency [Brit], marginal seat [Brit]

Derived forms: marginals

See also: minimal, minimum, narrow, peripheral, unprofitable

Encyclopedia: Marginal