singular in WordNet English dictionary

1. beyond or deviating from the usual or expected
   "a curious hybrid accent"; "her speech has a funny twang"; "they have some funny ideas about war"; "had an odd name"; "the peculiar aromatic odor of cloves"; "something definitely queer about this town"; "what a rum fellow"; "singular behavior"
   curious  funny  odd  peculiar  queer  rum  rummy  singular 
   
2. unusual or striking
   "a remarkable sight"; "such poise is singular in one so young"
   remarkable  singular 
   
3. grammatical number category referring to a single item or unit
   singular 
   
4. composed of one member, set, or kind
   singular 
   
5. being a single and separate person or thing
   "can the singular person be understood apart from his culture?"; "every fact in the world might be singular...unlike any other fact and sole of its kind"-William James
   singular 
   
6. the single one of its kind
   "a singular example"; "the unique existing example of Donne's handwriting"; "a unique copy of an ancient manuscript"; "certain types of problems have unique solutions"
   singular  unique 
   

1. the form of a word that is used to denote a singleton
   singular  singular form