1. Of the remaining member of a pair, of socks e.g.
   - odd, unmated, unpaired 
2. Eminent beyond or above comparison
   "infamy unmatched in the Western world"
   - matchless, nonpareil, one, one and only, peerless, unmatchable, unrivaled [US], unrivalled [Brit, Cdn]

See also: incomparable, mismatched, uncomparable

• reflectiveness
• reflectivity
• reflectometer
• reflector
• reflectorise
• reflectorize
• reflex
• reflex action
• reflex angle
• reflex arc
• reflex camera
• reflex epilepsy
• reflex response
• reflexed
• reflexion
• reflexive
• reflexive pronoun
• reflexive verb
• reflexively
• reflexiveness
• reflexivity
• reflexly
• reflexology
• refloat
• refluent