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) having been marginalized

See also: margin, marginality, marginally, minimal, minimum, narrow, peripheral, unprofitable

Encyclopedia: Marginal

• preferable
• preferably
• preference
• preference shares
• preferent
• preferential
• preferentially
• preferment
• preferred
• preferred shares
• preferred stock
• prefiguration
• prefigurative
• prefigure
• prefigurement
• prefix
• prefix notation
• prefixation
• preflight
• preform
• preformation
• preformatted
• prefrontal
• prefrontal cortex
• prefrontal leucotomy